heroic vs epic

heroic and epic both are nouns.

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

As adjectives, heroic and epic are synonyms defined as:

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

Other synonyms of heroic include larger-than-life.

As nouns, epic is a hypernym of heroic; that is, epic is a word with a broader meaning than heroic:

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

Other hypernyms of heroic include epic poem, epos, heroic poem.

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

heroic (adjective)	epic (adjective)
relating to or characteristic of heroes of antiquity	constituting or having to do with or suggestive of a literary epic
having or displaying qualities appropriate for heroes	very imposing or impressive; surpassing the ordinary (especially in size or scale)
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)