sarcasm vs wit

sarcasm and wit both are nouns.

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

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

sarcasm: 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 sarcasm include humor, humour, witticism, wittiness.

sarcasm (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