poetry vs epic poetry

poetry and epic poetry both are nouns.

Word	Noun	Adjective	Verb	Adverb
poetry	Yes	No	No	No
epic poetry	Yes	No	No	No

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

Other hyponyms of poetry include epos, heroic poetry.

poetry (noun)	epic poetry (noun)
literature in metrical form	poetry celebrating the deeds of some hero
any communication resembling poetry in beauty or the evocation of feeling