imitator vs imitate

imitator is a noun but imitate is not a noun.

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

imitator (noun)	imitate (noun)
someone who copies the words or behavior of another
someone who (fraudulently) assumes the appearance of another

imitator (verb)	imitate (verb)
	reproduce someone's behavior or looks
	make a reproduction or copy of
	appear like, as in behavior or appearance