adjective + -ness → nounUse -ness to turn many adjectives into nouns for qualities or states.
Noun Suffixes
B1Noun suffixes build nouns from adjectives and verbs. Use -ness, -tion, -ment, -ity, and -er when the sentence needs a thing, quality, result, or person.
What you'll learn
- Build quality nouns with -ness.
- Build common abstract nouns with -tion, -ment, and -ity.
- Name a person who does an action with -er.
- Choose the noun form when the sentence needs a thing or quality.
- Spell noun forms with common suffix changes.
Structure
base word + -tion / -ment / -ity → nounThese endings build many common abstract nouns. Learn the full word as a unit.
verb + -er → person nounUse -er to name the person who does the action.
Build a sentence
Base word
happyhappiness
Her happiness was easy to see.
Consonant + y changes to i before -ness: happy → happiness.
When to use
Qualities
Use noun suffixes to talk about qualities and states as things: kindness, darkness, happiness.
Results and processes
Use forms like discussion, development, and information to name actions, results, and ideas.
People and jobs
Use -er words for people who do actions: teacher, worker, driver, reader.
Markers
-ness-tion-ment-ity-er
Spelling
adjective ends in consonant + y
→ y → i + nesshappy → happinessbase word ends in silent e
→ drop e + ment / tiondevelop → developmentsome adjectives change before -ity
→ active → activity patternactive → activitysome words change ending before noun form
→ -ss + iondiscuss → discussionCommon mistakes
Wrong
We had a discuss about the budget.
Correct
We had a discussion about the budget.
After a, the sentence needs a noun, not a verb.
Wrong
Maria spoke about kind in her speech.
Correct
Maria spoke about kindness in her speech.
After about, English needs a noun here, so use kindness.
Wrong
Tom's happyness changed the room.
Correct
Tom's happiness changed the room.
With consonant + y, change y to i before -ness.
Wrong
The project shows real developement.
Correct
The project shows real development.
The correct noun is development. Learn the full spelling as one word.
Wrong
Anna is a teach at my school.
Correct
Anna is a teacher at my school.
For a person who does the action, English uses the noun teacher.
Common misconceptions
❝ I can add any common ending to a word and make the right noun. ❞
Noun suffixes are not fully free. Many words take one specific noun form, so learn the complete word: information, development, activity.
❝ Every person word comes from a verb + -er. ❞
-er is common, but not every person noun uses it. Use -er when it is the standard word, like teacher or worker.
Skills in this rule (6)
MAKE_NOUNS_WITH_NESSw4Use -ness to make nouns from adjectives
Add -ness to an adjective to name a quality or state: happy becomes happiness, kind becomes kindness. Use it when you want the thing itself, not a description.
MAKE_NOUNS_WITH_TION_MENT_ITYw5Use -tion, -ment, and -ity to build common abstract nouns
These endings turn verbs or adjectives into nouns: inform → information, develop → development, active → activity. Learn the full noun form and use it after articles, prepositions, and adjectives.
PERSON_WITH_ERw4Use -er for a person who does an action
Add -er to many verbs to name the person who does the action: teach → teacher, work → worker. Use it for jobs, roles, and everyday actions.
CHOOSE_NOUN_FORM_IN_SENTENCEw5Choose the noun form when the sentence needs a thing, result, or quality
Look for signals like an article, a preposition, or an adjective before the target word. In these places English often needs a noun, not a verb or adjective.
SPELL_COMMON_SUFFIX_CHANGESw4Spell common noun suffix changes correctly
Some base words change spelling when you add the suffix: happy → happiness, active → activity, discuss → discussion. Watch doubled letters, dropped letters, and y → i patterns.
RECOGNIZE_COMMON_NOUN_SUFFIXESw3Recognize common endings that often signal nouns
Endings like -ness, -tion, -ment, -ity, and -er often show that the word is a noun. Use them as a quick clue when reading or choosing a form.