caustic remark vs witticism

caustic remark and witticism both are nouns.

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

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

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

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

caustic remark (noun)	witticism (noun)
witty language used to convey insults or scorn	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter