impersonator vs imitator

impersonator and imitator both are nouns.

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

As nouns, impersonator and imitator are synonyms defined as:

impersonator and imitator: someone who (fraudulently) assumes the appearance of another

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