mime vs imitate

mime is a noun but imitate is not a noun.

Word	Noun	Adjective	Verb	Adverb
mime	Yes	No	Yes	No
imitate	No	No	Yes	No

As verbs, imitate is a hypernym of mime; that is, imitate is a word with a broader meaning than mime:

Other hypernyms of mime include copy, simulate.

mime (noun)	imitate (noun)
a performance using gestures and body movements without words
an actor who communicates entirely by gesture and facial expression

mime (verb)	imitate (verb)
act out without words but with gestures and bodily movements only	reproduce someone's behavior or looks
imitate (a person or manner), especially for satirical effect	make a reproduction or copy of
	appear like, as in behavior or appearance