mock vs imitative

mock is a noun but imitative is not a noun.

Word	Noun	Adjective	Verb	Adverb
mock	Yes	Yes	Yes	No
imitative	No	Yes	No	No

mock (noun)	imitative (noun)
the act of mocking or ridiculing

mock (adjective)	imitative (adjective)
constituting a copy or imitation of something	marked by or given to imitation
	(of words) formed in imitation of a natural sound
	not genuine; imitating something superior

mock (verb)	imitative (verb)
treat with contempt
imitate with mockery and derision