Forming nouns from adjectives 1

Grammar review Is there a pattern to forming nouns from adjectives?

Mostly, yes. A handful of suffixes cover most cases:

-ity: vain → vanity, human → humanity
-ness: bitter → bitterness, happy → happiness (note the y becomes i)
-ty: cruel → cruelty
-cy: vacant → vacancy
-dom: free → freedom

Some change more than just the ending. Poor becomes poverty, not "poorty"; the whole stem shifts, not just the suffix. These come from older Latin-derived word pairs, which is also why the noun and adjective don't always look like close relatives.

And a couple don't follow any pattern at all: proud becomes pride (a vowel change, no suffix added), and true becomes truth (an old pattern that doesn't apply to most other adjectives).

The takeaway: learn the common suffixes first. They'll get you most of the way there, but keep an eye out for high-frequency irregular pairs like these, since they show up constantly despite not following any rule.

Did you know? Word formation is a dedicated section of the Cambridge exam, and it’s highly learnable.

Cambridge Use of English Part 3 asks you to derive the correct word form from a given base. Converting adjectives to nouns is one of the most tested transformations: happy → happiness, responsible → responsibility, accurate → accuracy. Knowing which suffix to apply, and when the spelling changes, is a pattern-recognition skill that improves rapidly with targeted practice.

IELTS and TOEFL writing also reward this flexibility. A writer who can move fluidly between significant, significance, and significantly demonstrates the lexical range that pushes scores into Band 7+ and TOEFL 24+. This exercise builds that range one transformation at a time.