Noun- and Verb-Forming Suffixes

Level B2 · Adjectives & Adverbs

English also builds new nouns and verbs from other words by adding a suffix, not just adjectives. Turning a verb or adjective into a noun lets you talk about the quality, process, result, or person involved — happy (adjective) becomes happiness (a noun naming the quality), and develop (verb) becomes development (a noun naming the process or result). Turning an adjective or noun into a verb lets you talk about causing or becoming that quality — simple (adjective) becomes simplify (a verb meaning to make simple). Recognizing these noun- and verb-forming suffixes helps you build accurate word families and understand new vocabulary without needing a dictionary.

Common noun- and verb-forming suffixes and their meanings:

• -ness (adjective → noun, a quality or state) and -ment (verb → noun, a result or process): happy → happiness (the quality of being happy), kind → kindness, dark → darkness; develop → development (the process of developing), agree → agreement, move → movement.
• -tion / -sion (verb → noun, an action or process, often with a spelling change): decide → decision, inform → information, explain → explanation.
• -ity (adjective → noun, often for Latinate adjectives ending in -able or -al): possible → possibility, able → ability, active → activity.
• -er / -or (verb → noun, the person who does the action): teach → teacher, act → actor, write → writer.
• -ise / -ize (adjective/noun → verb, to make something have that quality — British -ise, American -ize), -en (adjective → verb, to make something more that quality), and -ify (noun/adjective → verb): modern → modernise/modernize, short → shorten, wide → widen, simple → simplify, class → classify, beauty → beautify.

The most common mistake is picking the wrong suffix for a base word by analogy with a different word that doesn't follow the same pattern. Happiness is correct, but a form like 'sadity' has to be ruled out case by case, because suffix choice in English isn't fully predictable from the base word alone (sad → sadness is correct, not 'sadity'). There's no single universal rule, so specific noun and verb forms often have to be learned individually, the same way vocabulary is learned. A second frequent mistake is adding a suffix to the wrong part of speech, or doubling up an ending that's already there — 'developmention' or 'shortenify' are wrong; add only one suffix layer at a time, starting from a form that already exists.

Look for a word ending in -ness/-ment/-tion/-sion/-ity/-er/-or that names a quality, process, result, or person doing something — that's a noun. Look for a word ending in -ise/-ize/-en/-ify that describes causing or becoming that quality — that's a verb. The ending signals the part of speech before you even know the exact meaning.

Practice

Noun- and Verb-Forming Suffixes: Choose the Right Form · Mixed Practice