humourist vs wit

humourist and wit both are nouns.

Word	Noun	Adjective	Verb	Adverb
humourist	Yes	No	No	No
wit	Yes	No	No	No

As nouns, wit is a hyponym of humourist; that is, wit is a word with a more specific, narrower meaning than humourist:

Other hyponyms of humourist include lampooner, parodist, punster, ironist, ridiculer, satirist, card, wag.

humourist (noun)	wit (noun)
someone who acts, speaks or writes in an amusing way	mental ability
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a witty amusing person who makes jokes