poesy vs epos

poesy and epos both are nouns.

Word	Noun	Adjective	Verb	Adverb
poesy	Yes	No	No	No
epos	Yes	No	No	No

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

poesy: literature in metrical form
epos: a body of poetry that conveys the traditions of a society by treating some epic theme

Other hyponyms of poesy include epic poetry, heroic poetry.

poesy (noun)	epos (noun)
literature in metrical form	a long narrative poem telling of a hero's deeds
	a body of poetry that conveys the traditions of a society by treating some epic theme