impersonation vs witticism

impersonation and witticism both are nouns.

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

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

impersonation: a representation of a person that is exaggerated for comic effect
witticism: a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter

Other hypernyms of impersonation include humor, humour, wit, wittiness.

impersonation (noun)	witticism (noun)
imitating the mannerisms of another person	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
pretending to be another person
a representation of a person that is exaggerated for comic effect