heroic poem vs epos

heroic poem and epos both are nouns.

Word	Noun	Adjective	Verb	Adverb
heroic poem	Yes	No	No	No
epos	Yes	No	No	No

As nouns, heroic poem and epos are synonyms defined as:

Other synonyms of heroic poem include epic, epic poem.

heroic poem (noun)	epos (noun)
a long narrative poem telling of a hero's deeds	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