What Are Suffixes: Examples That Make English Word Endings Clear

Short answer

• A suffix is an ending. It is a letter or group of letters added to the end of a base word to change its meaning or its grammatical job. A prefix does the opposite job at the opposite end: it is added to the beginning.
• Derivational suffixes build new words. They usually change the part of speech or the meaning: teach (verb) becomes teacher (noun), care (noun) becomes careful (adjective), quick becomes quickly (adverb).
• Inflectional suffixes add grammar only. They change neither the part of speech nor the core meaning: dog becomes dogs (plural), walk becomes walked (past), big becomes bigger (comparative). English has only eight.
• Learn suffixes by family. -ness, -ment, -tion, and -ity make nouns. -ful, -less, -able, -ous, and -ive make adjectives. -ize, -ify, and -en make verbs. -ly makes most adverbs.
• Watch the spelling when you add one. The three big patterns are dropping a final silent e before a vowel suffix (make, making), changing a final y to i after a consonant (happy, happiness), and doubling a final consonant after a single short vowel (stop, stopped).
• Not every ending works the way it looks. Friendly and lonely end in -ly but are adjectives, not adverbs, and visible is built on a Latin root, not a standalone English word. Context and a dictionary settle such cases.

Introduction

A suffix is a letter or group of letters added to the end of a word. It changes the meaning of the word, or the job the word does in a sentence, or both. The word you start with is the base word. The ending you attach is the suffix. Together they make a word a reader can often decode in two parts: happy names a feeling, and happiness, with the suffix -ness added, names that feeling as a thing you can talk about.

That decoding skill is why suffixes matter so much for reading, writing, and vocabulary learning. English reuses a relatively small set of endings across thousands of words. Once you know what -ness, -ment, -ful, -less, -able, and -ly usually do, you can make a good first guess at many unfamiliar words without a dictionary, choose the right word form when you write, and spell the result correctly, because adding a suffix follows spelling patterns that can be learned.

This article explains the main suffix families by the job they do, separates the two big classes of suffix, derivational and inflectional, works through the spelling rules for adding suffixes, shows how to split unfamiliar words into base and ending, and ends with practice examples and the errors learners most often make. One caution runs through it: suffixes give strong clues, not guarantees. Some words are built on roots from other languages rather than on a standalone English base, and some words have drifted in meaning over time. Use the suffix as a first step, and check a dictionary when the result does not make sense.

What a Suffix Is: Base Words, Roots, and Endings

Merriam-Webster defines a suffix as an affix occurring at the end of a word, base, or phrase, and Cambridge Dictionary defines it as a letter or group of letters added at the end of a word to make a new word. Affix is the umbrella term: prefixes and suffixes are both affixes, and the difference is position. A prefix attaches at the front, as un- does in unhappy. A suffix attaches at the back, as -ness does in happiness. A word can carry both: unhelpfulness has the prefix un-, the base help, and two suffixes, -ful and -ness, stacked in layers.

Three terms are worth keeping separate. A base word is a complete word that can stand alone before anything is added: kind in kindness, read in readable. A root is the core a word family is built on, and it does not always stand alone in modern English. Visible, credible, and audible are built on Latin roots for seeing, believing, and hearing; there is no standalone English base word vis, cred, or aud to attach -ible to. A stem is whatever a suffix is being attached to in a particular step, which may itself already contain a suffix: careful is the stem when -ly is added to make carefully.

A suffix cannot stand alone, and on its own it has no full meaning. What it has is a regular contribution. The suffix -less contributes the idea “without” so reliably that a reader who has never seen guileless can still guess it means without guile. That regularity is what makes suffixes worth learning as a system rather than word by word.

The Two Classes: Derivational and Inflectional Suffixes

Every English suffix belongs to one of two classes, and telling them apart removes most of the confusion learners feel.

Derivational suffixes derive a new word. They typically change the part of speech, the meaning, or both. Adding -ment to the verb develop produces the noun development. Adding -ful to the noun care produces the adjective careful. Adding -ly to careful produces the adverb carefully, a derivational suffix applied to a word that already carries one. There are hundreds of derivational suffixes, and they are the main subject of the family sections below. They can also shift a word’s stress: PHOtograph becomes phoTOGraphy, and ACtive becomes acTIVity when -ity is added.

Inflectional suffixes do a narrower, purely grammatical job. They mark number, tense, possession, or degree, and they never change the part of speech or the core meaning. Walked is still a verb about walking; it is simply placed in the past. English has only eight inflectional suffixes, and the set is closed:

• Plural -s or -es: dog, dogs; box, boxes.
• Possessive -‘s: the teacher’s desk.
• Third person singular -s: she reads, he writes.
• Past tense -ed: walk, walked.
• Past participle -en or -ed: taken, broken, walked.
• Present participle -ing: walking, reading.
• Comparative -er: bigger, faster.
• Superlative -est: biggest, fastest.

Two practical points follow. First, the same letters can belong to either class. The -er in teacher is derivational: it changes a verb into a noun naming a person. The -er in bigger is inflectional: bigger is still an adjective, just in its comparative form. Judge a suffix by the job it is doing in that word, not by its letters alone. Second, inflectional suffixes are where verb tense endings live, so a reader working on tense forms is working with this class: the guide to the past tense covers the -ed family and its irregular exceptions in full.

Suffixes That Make Nouns

Noun suffixes turn verbs and adjectives into words that name a thing, an idea, a quality, a person, or a state. They are among the most useful suffixes in formal writing, because they let a writer treat an action or a quality as a topic.

The suffix -ness turns an adjective into a noun naming a quality or a state. Happy becomes happiness, the state of being happy. Kind becomes kindness. Dark becomes darkness. The base gives the core idea, and -ness turns it into something you can name and put at the start of a sentence: “Her kindness surprised us.”

The suffix -ment turns a verb into a noun naming an action, a process, a result, or a state. Move becomes movement. Agree becomes agreement, the result of agreeing. Develop becomes development. Enjoy becomes enjoyment. The base usually keeps its final e before -ment, because the suffix begins with a consonant: movement, amazement. Argument is the well known exception, dropping the e of argue.

The suffix -tion, and its variant -sion, turns a verb into a noun naming an action or its result. Act becomes action. Create becomes creation, with the final e dropped. Decide becomes decision, where the base itself changes shape, a reminder that -sion words often rest on a Latin root form rather than on the modern verb spelled out in full. Discuss becomes discussion. These endings stand behind many formal nouns: information, education, decision, permission.

The suffix -ity turns an adjective into a noun, often in formal words, and it frequently moves the stress, as in active, activity and sensitive, sensitivity. Pure becomes purity, with the final e dropped. Possible becomes possibility, built through the -ible adjective. Unlike -ness, which attaches to almost any adjective, -ity attaches to a limited set, many from Latin, so there is no *clearity: clarity comes from a Latin stem, not from adding -ity to the English word clear.

The suffixes -er and -or often name a person who does an action, and sometimes a thing that performs a function. Teach becomes teacher. Write becomes writer. Act becomes actor, with -or, a spelling that usually reflects a Latin origin and cannot be predicted from sound alone: compare sailor and editor with teacher and baker. A printer and an opener are things, not people, so read -er as “a person or thing connected with the action”.

The suffix -ist names a person who practices a field, follows a belief, or plays an instrument: art becomes artist, novel becomes novelist, piano becomes pianist. The related suffix -ism names the practice, system, or belief itself: capitalism, optimism, journalism. The suffixes -ance and -ence name a state, quality, or action: importance, performance, difference, independence. As with -er and -or, the choice between them cannot be heard reliably and has to be learned word by word or checked.

Suffixes That Make Adjectives

Adjective suffixes turn nouns and verbs into describing words. Two form the most teachable pair in English.

The suffix -ful means full of, or characterized by. Hope becomes hopeful, full of hope. Care becomes careful. Wonder becomes wonderful. The suffix -less means without, or lacking. Hope becomes hopeless. Care becomes careless. Fear becomes fearless. Because the same base can often take either ending, the pair shows a suffix changing meaning in the clearest way: a helpful answer is full of help, a helpless attempt is without the power to help, and the base has not changed. Watch the spelling: -ful has one l, as in careful and beautiful, and the double l appears only when -ly follows, as in carefully.

The suffix -able, and its variant -ible, means able to be, or worthy of being. Read becomes readable, able to be read. Break becomes breakable. Wash becomes washable. Visible means able to be seen and audible means able to be heard, both built with -ible on Latin roots. The working rule is that -able attaches to complete English base words, while -ible usually appears where the base is not a complete modern English word. It is a tendency, not a law: accessible, possible, and terrible take -ible, while comfortable, reliable, and enjoyable take -able. A dictionary is the authority here.

The suffix -ous means full of, or having the quality of: danger becomes dangerous, fame becomes famous, with the e dropped, and courage becomes courageous, where the e is kept to protect the soft g sound. The suffix -ive means tending to: act becomes active, create becomes creative, talk becomes talkative. The suffix -al means relating to: nation becomes national, music becomes musical. The suffix -ish means somewhat, or having the nature of: red becomes reddish; child becomes childish. The suffix -y means characterized by: rain becomes rainy, sleep becomes sleepy, health becomes healthy.

Suffixes That Make Verbs

Verb suffixes are fewer, but they explain how a describing or naming word becomes an action word.

The suffix -ize, spelled -ise in British English but -ize in the American English used here, often means to make or to become. Modern becomes modernize, to make modern. Standard becomes standardize. Computer becomes computerize. The suffix -ify means to make or to cause to become: simple becomes simplify, pure becomes purify, class becomes classify. The final y belongs to the suffix itself, which is why words in -ify keep that y in the base form and change it under Rule 2 in other forms: simplifies, purified, classified.

The suffix -en turns an adjective into a verb meaning to make or become that quality. Wide becomes widen, to make wide. Short becomes shorten. Dark becomes darken. Soft becomes soften, where the t is silent. The nouns strength and length take the same ending to become the verbs strengthen and lengthen. This suffix is choosy: it attaches mainly to short adjectives ending in a consonant, which is why English has widen and blacken but no *beautifulen. Longer adjectives use make plus the adjective, or a separate verb, such as enlarge for large. The suffix -ate appears in verbs such as activate and motivate, mostly on Latin based words, and is best learned word by word.

Suffixes That Make Adverbs

The suffix -ly is the most common adverb suffix in English. Added to an adjective, it produces an adverb describing how an action happens. Quick becomes quickly, in a quick manner. Slow becomes slowly. Careful becomes carefully. Happy becomes happily, with the y changed to i. These adverbs answer the question “how?” about a verb: she spoke slowly, he drove carefully.

Two cautions keep -ly from being misread. First, -ly also appears in adjectives. Friendly, lonely, lovely, lively, and costly describe nouns, not actions: a friendly teacher, a lonely road. These words are mostly built by adding -ly to a noun, friend, lone, love, life, cost, rather than to an adjective, and most have no adverb twin in regular use: people write “in a friendly way” rather than *friendlily. Second, some adverbs have no -ly at all. Fast, hard, and late work as both adjective and adverb: a fast car, drive fast; a hard problem, work hard. Hardly is a different word meaning “almost not”, so “he worked hardly” says nearly the opposite of what most learners intend.

Two smaller adverb suffixes are worth recognizing: -ward signals direction (homeward, forward, backward), and -wise signals orientation in clockwise.

Spelling Rules When You Add a Suffix

Adding a suffix can change the spelling of the base word. The changes are not random: three main rules, plus their exceptions, cover most of what a writer meets. The dividing line in two of the rules is whether the suffix begins with a vowel letter (a, e, i, o, u) or a consonant letter.

Rule 1: drop a final silent e before a vowel suffix, and keep it before a consonant suffix. Make becomes making and maker, not *makeing. Create becomes creative and creating. Fame becomes famous. Hope becomes hoping. Before a consonant suffix the e usually stays: care becomes careful, hope becomes hopeful, move becomes movement, rude becomes rudeness. Two exception groups matter. Words ending in -ce or -ge keep the e before -able and -ous to protect their soft sound: noticeable, manageable, courageous. And a few words drop the e before a consonant suffix anyway: argue becomes argument, true becomes truly, due becomes duly, whole becomes wholly.

Rule 2: change a final y to i when the letter before the y is a consonant, except before -ing. Happy becomes happiness, happily, and happier. Try becomes tried and tries. Beauty becomes beautiful. Study becomes studied and studious. The y stays before -ing, because English avoids the double i, so trying, studying, and crying keep it; after a vowel, so play becomes played, enjoy becomes enjoyment, and day becomes days; and in a few short words before -ly, such as shyly.

Rule 3: double a final consonant after a single short vowel, in a stressed syllable, before a vowel suffix. Run becomes running and runner. Stop becomes stopped and stopping. Big becomes bigger and biggest. Begin becomes beginning, and admit becomes admitted, because the stress falls on the final syllable. Do not double when the conditions are not met: open becomes opened, because the stress is on the first syllable; rain becomes rained, because two vowel letters precede the consonant; help becomes helped, because the base already ends in two consonants; and fix becomes fixing, because x already represents two sounds. Do not double before a consonant suffix either: hot becomes hotly, but hottest doubles the t because -est begins with a vowel.

A note on -able spelling follows from Rule 1. A base ending in silent e usually drops it before -able: use becomes usable, love becomes lovable, with loveable also accepted. A base ending in -ce or -ge keeps it: notice becomes noticeable. No tendency replaces a dictionary check for an unfamiliar word.

How to Use Suffixes to Read New Words

When you meet an unfamiliar word, work from the end. First, look for a known suffix and set it aside. Second, read what remains and ask whether it is a base word you know. Third, combine the two: the base gives the core idea, and the suffix tells you the word’s job. Apply it to kindness: the suffix is -ness, the base is kind, and the word means the quality of being kind. Apply it to readable: the suffix is -able, the base is read, and the word means able to be read. Apply it to unemployment: the prefix un- reverses, the base employ is a verb, and -ment turns it into a noun naming the state of not having employment.

The same habit works in writing, in reverse. Decide the job you need first, then reach for the family that does it. To name a quality, try -ness, and check whether a formal -ity form exists. To name an action or its result, try -ment or -tion. To describe something as full of a quality, try -ful or -ous; as without it, -less; as able to be acted on, -able. To describe how an action happens, add -ly to the adjective. These are starting points, not guarantees, because each base accepts only some suffixes: English has enjoyment but not *enjoyness in ordinary use, payment but not *paytion. Confirm the candidate in a dictionary before you rely on it.

Informal writing uses the same decoding habit in miniature, splitting a short form into what is known and what context suggests. The walkthrough of what OMK means in a text shows its limits when a form has no settled expansion: standard word endings are far more regular than texting abbreviations, which is why suffixes repay study and abbreviations often have to be asked about instead.

Word endings are one of two big signal systems in written English; the other is punctuation. Readers who want the companion skill can work through the em dash vs en dash explainer next: suffixes tell you what a word is doing, and dashes tell you how its clauses are grouped.

Practice: Worked Examples

Try splitting each word before reading the answer: base, plus suffix, plus its job.

1. Predictable. Base: predict, a verb. Suffix: -able. Job: adjective. Meaning: able to be predicted. The base keeps its spelling, because predict does not end in silent e.
2. Hopelessness. Base: hope, a noun. First suffix: -less, making the adjective hopeless, without hope. Second suffix: -ness, making a noun again. Meaning: the state of being without hope. Two suffixes, two job changes, one word.
3. Modernize. Base: modern, an adjective. Suffix: -ize. Job: verb. Meaning: to make modern. The final n is not doubled, because the stress falls on the first syllable.
4. Carefully. Base: care, through its adjective careful. Suffixes: -ful, then -ly. Meaning: in a manner full of care. The single l of -ful gains a second l from -ly.
5. Stopped. Base: stop, a verb. Suffix: -ed, the inflectional past tense ending. The p doubles under Rule 3: one syllable, one short vowel, one final consonant.
6. National. Base: nation, a noun. Suffix: -al. Job: adjective. Meaning: relating to a nation. The pronunciation shifts inside the base, a common effect in this word family: nation, national, nationality.

Common Learner Errors

Most suffix mistakes fall into a short list of repeatable patterns. Each error below is shown in its wrong form, marked with an asterisk, followed by the correction and its rule.

• *happyly for happily. A consonant plus y changes to i before -ly, under Rule 2. The same fix gives easily, not *easyly, and angrily, not *angryly.
• *stoping for stopping, and *runing for running. A single short vowel plus a single final consonant doubles before -ing, under Rule 3.
• *makeing for making, and *comeing for coming. A final silent e drops before -ing, under Rule 1.
• *carefuly for carefully. Careful ends in one l, and -ly adds its own, so the adverb has ll where the parts meet. Compare truly: true drops its e before -ly, giving truly, not *truely.
• *arguement for argument. Argue is one of the few bases that drop the e before a consonant suffix.
• *friendlily as the adverb of friendly. Friendly is an adjective despite its ending, and standard English avoids an adverb form. Rewrite: “she spoke in a friendly way”.
• *informations and *advices. Information and advice are uncountable nouns and take no plural suffix. Say pieces of information, or pieces of advice.
• *more faster and *most biggest. The suffixes -er and -est already mark the comparison, so faster and biggest need no more or most.
• Choosing -able or -ible by sound alone. The endings sound identical, so sound cannot decide between readable and *readible, or visible and *visable. Learn the word, or check it.
• Treating every base as free standing. Splitting visible into vis plus -ible produces a base that does not exist in modern English. When a split leaves an unrecognized fragment, the word probably rests on a Latin root, and a dictionary shows the real structure.

Example Sentences

These sentences show suffixes doing their jobs in ordinary writing. The first six are carried over from the source package, and the rest extend the set into the families added in this adaptation.

• Her kindness to new students made the whole class feel welcome.
• The development of the garden took a full year of careful work.
• The instructions were readable, even for a reader in a hurry.
• He gave a fearless answer, even though the question was difficult.
• She spoke slowly, so that every listener could follow the argument.
• The teacher praised the student’s creative solution to a hard problem.
• His explanation was predictable, but its clarity made it worth hearing twice.
• After three stops, the driver checked the map and drove homeward.
• A hopelessness she did not mean to show crept into her last letter.

Kindness names a quality, development a process, readable a text that can be read, fearless a person without fear, and slowly how she spoke. Clarity shows a Latin based -ity noun, homeward the direction suffix -ward, and hopelessness two suffixes stacked in one word.

Frequently Asked Questions

What is a suffix in simple terms? A suffix is a letter group added to the end of a base word to change its meaning or its job in a sentence. In happiness, the suffix -ness turns the adjective happy into a noun naming a state.

What is the difference between a suffix and a prefix? Position and direction of work. A suffix is added to the end of a word, and a prefix is added to the beginning. In unhappy, un- is a prefix that reverses the meaning. In happiness, -ness is a suffix that changes the word class. A word can carry both at once, as unhappiness does.

What is the difference between derivational and inflectional suffixes? A derivational suffix builds a new word, usually with a new part of speech or a changed meaning: teach becomes teacher. An inflectional suffix adds only grammar, such as tense, number, or degree, and never changes the part of speech: walk becomes walked, dog becomes dogs. English has hundreds of derivational suffixes and only eight inflectional ones.

Can a word have more than one suffix? Yes. English builds words in layers, and each layer can change the job again. Care becomes careful with -ful, and careful becomes carefully with -ly. Hope becomes hopeless with -less, and hopeless becomes hopelessness with -ness. The suffix closest to the base applies first.

Does every word that ends in -ly work as an adverb? No. Friendly, lonely, lovely, lively, and costly end in -ly and are adjectives. Reliable -ly adverbs are built by adding -ly to an adjective, such as quick, quickly and careful, carefully. If the base is a noun, the result is usually an adjective.

Is -er always the person who does an action? No, in two ways. Derivational -er can name a thing as well as a person: a printer, an opener. And inflectional -er does a different job entirely, marking comparison in bigger and faster, where no person is involved.

How do I choose between -able and -ible? Start with the base. If the base is a complete English word, -able is the usual ending: readable, washable, comfortable. If what remains after removing the ending is not a complete modern English word, -ible is likely: visible, audible, credible. Treat that as a first guess only, and check a dictionary, because the pair is one of the least predictable choices in English spelling.

Can a suffix change how a word is pronounced? Yes. Derivational suffixes can move the stress and change vowel sounds inside the base: photograph and photography, nation and national, active and activity. Inflectional suffixes never do this: walked, walks, and walking keep the stress and sound of walk.

Sources & references

• Merriam-Webster, entry for suffix and explainer "What are prefixes, suffixes, and combining forms?" Material read via search result excerpts on 3 November 2026: a suffix is an affix occurring at the end of a word, base, or phrase; prefixes and suffixes are both kinds of affixes, word parts that attach to the beginning or end of a word or word base to produce a related word; and the dictionary example of adding -y to sleep to make sleepy.
• Cambridge Dictionary, entry for suffix. Material read via search result excerpts on 3 November 2026: a suffix is a letter or group of letters added at the end of a word to make a new word.
• EnglishClub, Suffixes reference page. Material read via search result excerpts on 3 November 2026: a suffix makes a new word in one of two ways, inflectional, changing singular to plural (dog, dogs) or present to past (walk, walked) without changing the basic meaning, and derivational, producing a new meaning usually in a different part of speech (teach, teacher; care, careful); the page's inflectional list covers plural -s and irregular plural -en (ox, oxen), and its derivational list covers -ness, -ment, -able, -ful, and -ly in both adjective and adverb uses.
• Spelling rule references for adding suffixes, read via search result excerpts on 3 November 2026 from school and writing lab style rule sheets: change y to i after a consonant except before -ing; double a final consonant after a single vowel in a stressed syllable before a vowel suffix (swim, swimming; begin, beginning); drop a silent final e before a vowel suffix and keep it before a consonant suffix (care, careful; move, movement), with the -ce and -ge exceptions before -able and -ous (noticeable, courageous) and the argue, argument exception.