country music vs C and W

country music and C and W both are nouns.

Word	Noun	Adjective	Verb	Adverb
country music	Yes	No	No	No
C and W	Yes	No	No	No

As nouns, country music and C and W are synonyms defined as:

country music and C and W: a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments

Other synonyms of country music include country and western.

country music (noun)	C and W (noun)
a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments	a simple style of folk music heard mostly in the southern United States; usually played on stringed instruments