mental capacity vs wit

mental capacity and wit both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental capacity	Yes	No	No	No
wit	Yes	No	No	No

As nouns, mental capacity and wit are synonyms defined as:

Other synonyms of mental capacity include brain, brainpower, learning ability, mentality.

mental capacity (noun)	wit (noun)
mental ability	mental ability
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a witty amusing person who makes jokes