imitation vs mockery

imitation and mockery both are nouns.

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

As nouns, mockery is a hyponym of imitation; that is, mockery is a word with a more specific, narrower meaning than imitation:

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

Other hyponyms of imitation include mock-heroic, burlesque, lampoon, parody, pasquinade, put-on, send-up, sendup, spoof, takeoff, travesty.

imitation (noun)	mockery (noun)
copying (or trying to copy) the actions of someone else	humorous or satirical mimicry
something copied or derived from an original	showing your contempt by derision
the doctrine that representations of nature or human behavior should be accurate imitations	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

imitation (adjective)	mockery (adjective)
not genuine or real; being an imitation of the genuine article