Common English Suffixes: -er, -ment, -ful and -less
Explore English suffixes -er, -ment, -ful and -less with everyday word examples, spelling checks and practice choosing the form your sentence needs.
A suffix is added to the end of a base word. Four useful English endings are -er, -ment, -ful and -less. They can help create nouns or adjectives, as in teacher, improvement, useful and careless. Check the complete word because an ending does not always have one meaning.
Suffixes are useful clues when reading and writing. They can suggest the kind of word a sentence needs, but they do not replace a dictionary check. Learn the form with an example you understand.
Compare four useful endings
Suffix | Common job | Original example |
|---|---|---|
-er | Names a person or thing that does something | The driver stopped at the crossing. |
-ment | Forms a noun, often from a verb | We noticed an improvement. |
-ful | Forms an adjective | The instructions were useful. |
-less | Forms an adjective, often suggesting without | It was a careless mistake. |
Scroll sideways to see all columns.
A family can include several forms with different jobs. Our earlier word families guide shows how to connect them, while the prefix lesson covers changes at the beginning of a word.
Recognise different uses of -er
Teach becomes teacher, and drive becomes driver. These nouns name people who perform an action. A cooker or printer can name a thing, so this ending is not limited to people. Write becomes writer, with the final e removed before adding -er.
The -er in smaller or faster has another job: it makes a comparison. “She's a fast runner” contains runner, a noun naming a person, and fast, an adjective. “She's faster today” contains a comparative adjective. The comparatives guide explains the comparison pattern.
Use -ment nouns in sentence patterns
Improve becomes improvement, arrange becomes arrangement and agree becomes agreement. These nouns can name a process, result or state associated with the verb. Try a pair: “We agreed on a time” and “We reached an agreement.” The related idea stays, but the grammar changes.
Do not assume every verb makes a common noun with -ment. For decide, the usual noun is decision, not decidement. Keep useful combinations such as “make an arrangement” with your examples instead of practising only the word's spelling.
Compare -ful with -less
Useful means helpful for a purpose; useless means not useful for that purpose. Careful suggests attention, while careless suggests insufficient care or attention. Meaning can be more specific than simply adding “full of” or “without” to a base word.
Write -ful with one l at the end: helpful, useful, colourful. Some spelling changes need checking, such as beauty becoming beautiful. If you add -ly to careful, the result is carefully, with two l letters at that boundary. Check the actual word rather than carrying one spelling shortcut into every form.
Choose the word class and the meaning
In “There was a big ___”, you may need a noun such as improvement. In “The map was ___”, an adjective such as useful may fit. The surrounding words provide clues, but the situation chooses the meaning. “The map was useless” has the same grammatical shape and a very different message.
Our adjectives and adverbs lesson helps when you need to distinguish “a careful driver” from “she drives carefully”. A noun, adjective and adverb can describe related ideas while occupying different places in a sentence.
Your turn · self-review
Use an ending in context
Complete each sentence and explain the form before checking the model.
Practice only. Your writing stays on this page; it is not submitted or saved.
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Model answer and explanation
My reading has started to improve. I can see an improvement. The first gap takes the verb; the second needs a noun after an.
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Model answer and explanation
They are careful. They check the address twice before sending the parcel. Careless would suggest a lack of attention, which does not match this description.
Make a small suffix collection
Choose one useful word for each ending and write a personal example. Check spelling, pronunciation and word class with the earlier dictionary guide. Leave out forms you do not expect to use.
On another day, cover the words and rebuild the sentences from memory. If you choose a different word that still expresses the intended meaning, check it too. Suffix knowledge helps most when it supports a clear sentence.
