wit vs mental capacity

wit and mental capacity both are nouns.

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

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

Other synonyms of wit include brain, brainpower, learning ability, mentality.

wit (noun)	mental capacity (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