copycat vs epigon

copycat and epigon both are nouns.

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

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

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

Other hyponyms of copycat include epigone, parrot.

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