C and W vs bluegrass

C and W and bluegrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
C and W	Yes	No	No	No
bluegrass	Yes	No	No	No

As nouns, bluegrass is a hyponym of C and W; that is, bluegrass is a word with a more specific, narrower meaning than C and W:

C and W: a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments
bluegrass: a type of country music played at a rapid tempo on banjos and guitars

Other hyponyms of C and W include hillbilly music, zydeco.

C and W (noun)	bluegrass (noun)
a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments	a type of country music played at a rapid tempo on banjos and guitars
	any of various grasses of the genus Poa