part music vs homophony

part music and homophony both are nouns.

Word	Noun	Adjective	Verb	Adverb
part music	Yes	No	No	No
homophony	Yes	No	No	No

As nouns, homophony is a hyponym of part music; that is, homophony is a word with a more specific, narrower meaning than part music:

part music: vocal music for several voices in independent parts (usually performed without accompaniment)
homophony: part music with one dominant voice (in a homophonic style)

part music (noun)	homophony (noun)
vocal music for several voices in independent parts (usually performed without accompaniment)	part music with one dominant voice (in a homophonic style)
	the same pronunciation for words of different origins