imitator vs epigon

imitator and epigon both are nouns.

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

As nouns, epigon is a hyponym of imitator; that is, epigon is a word with a more specific, narrower meaning than imitator:

imitator: someone who copies the words or behavior of another
epigon: an inferior imitator of some distinguished writer, artist, or musician

Other hyponyms of imitator include epigone, parrot.

imitator (noun)	epigon (noun)
someone who copies the words or behavior of another	an inferior imitator of some distinguished writer, artist, or musician
someone who (fraudulently) assumes the appearance of another