irony vs wittiness

irony and wittiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
irony	Yes	No	No	No
wittiness	Yes	No	No	No

As nouns, wittiness is a hypernym of irony; that is, wittiness is a word with a broader meaning than irony:

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

Other hypernyms of irony include humor, humour, wit, witticism.

irony (noun)	wittiness (noun)
incongruity between what might be expected and what actually occurs	The quality of being clever, amusingly ingenious.
a trope that involves incongruity between what is expected and what occurs	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
witty language used to convey insults or scorn