caustic remark vs wit

caustic remark and wit both are nouns.

Word	Noun	Adjective	Verb	Adverb
caustic remark	Yes	No	No	No
wit	Yes	No	No	No

As nouns, wit is a hypernym of caustic remark; that is, wit is a word with a broader meaning than caustic remark:

caustic remark: witty language used to convey insults or scorn
wit: a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter

Other hypernyms of caustic remark include humor, humour, witticism, wittiness.

caustic remark (noun)	wit (noun)
witty language used to convey insults or scorn	mental ability
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a witty amusing person who makes jokes