joy vs rhapsody

joy and rhapsody both are nouns.

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

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

joy (noun)	rhapsody (noun)
something or someone that provides a source of happiness	(in ancient Greece) an epic poem adapted for recitation
the emotion of great happiness	(music) a free instrumental composition in one extended movement; typically emotional or exuberant in character
	an enthusiastic expression of emotion

joy (verb)	rhapsody (verb)
feel happiness or joy
make glad or happy