mockery vs impersonation

mockery and impersonation both are nouns.

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

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

mockery: a composition that imitates or misrepresents somebody's style, usually in a humorous way
impersonation: a representation of a person that is exaggerated for comic effect

Other hypernyms of mockery include caricature, imitation.

mockery (noun)	impersonation (noun)
humorous or satirical mimicry	imitating the mannerisms of another person
showing your contempt by derision	pretending to be another person
a composition that imitates or misrepresents somebody's style, usually in a humorous way	a representation of a person that is exaggerated for comic effect