country and western vs country music

country and western and country music both are nouns.

Word	Noun	Adjective	Verb	Adverb
country and western	Yes	No	No	No
country music	Yes	No	No	No

As nouns, country and western and country music are synonyms defined as:

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

Other synonyms of country and western include C and W.

country and western (noun)	country music (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