epic poem vs heroic poem

epic poem and heroic poem both are nouns.

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

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

epic poem and heroic poem: a long narrative poem telling of a hero's deeds

Other synonyms of epic poem include epic, epos.

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