sarcasm vs witticism

sarcasm and witticism both are nouns.

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

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

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

sarcasm (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