imitator vs impersonator

imitator and impersonator both are nouns.

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

As nouns, imitator and impersonator are synonyms defined as:

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

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