epic vs heroic

epic and heroic both are nouns.

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

As adjectives, epic and heroic are synonyms defined as:

epic and heroic: very imposing or impressive; surpassing the ordinary (especially in size or scale)

Other synonyms of epic include larger-than-life.

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

epic: a long narrative poem telling of a hero's deeds
heroic: a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter

Other hyponyms of epic include chanson de geste, rhapsody, heroic meter, heroic verse.

epic (noun)	heroic (noun)
a long narrative poem telling of a hero's deeds	a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter

epic (adjective)	heroic (adjective)
constituting or having to do with or suggestive of a literary epic	relating to or characteristic of heroes of antiquity
very imposing or impressive; surpassing the ordinary (especially in size or scale)	having or displaying qualities appropriate for heroes
	showing extreme courage; especially of actions courageously undertaken in desperation as a last resort
	of behavior that is impressive and ambitious in scale or scope
	very imposing or impressive; surpassing the ordinary (especially in size or scale)