Epos and Heroic poem

Epos noun - A long narrative poem telling of a hero's deeds.

Heroic poem is a synonym for epos. In some cases you can use "Heroic poem" instead a noun "Epos".

Heroic poem noun - A long narrative poem telling of a hero's deeds.

Epos is a synonym for heroic poem. You can use "Epos" instead a noun phrase "Heroic poem".