impersonate vs impersonator

impersonate is not a noun while impersonator is a noun.

Word	Noun	Adjective	Verb	Adverb
impersonate	No	No	Yes	No
impersonator	Yes	No	No	No

impersonate (noun)	impersonator (noun)
	someone who (fraudulently) assumes the appearance of another

impersonate (verb)	impersonator (verb)
pretend to be someone you are not; sometimes with fraudulent intentions
represent another person with comic intentions
assume or act the character of