imitator vs aper

imitator and aper both are nouns.

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

As nouns, imitator and aper are synonyms defined as:

Other synonyms of imitator include ape, copycat, emulator.

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