epic vs rhapsody

epic and rhapsody both are nouns.

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

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

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

epic (noun)	rhapsody (noun)
a long narrative poem telling of a hero's deeds	(in ancient Greece) an epic poem adapted for recitation
	(music) a free instrumental composition in one extended movement; typically emotional or exuberant in character
	an enthusiastic expression of emotion

epic (adjective)	rhapsody (adjective)
constituting or having to do with or suggestive of a literary epic
very imposing or impressive; surpassing the ordinary (especially in size or scale)