square-dance music vs folk

square-dance music and folk both are nouns.

Word	Noun	Adjective	Verb	Adverb
square-dance music	Yes	No	No	No
folk	Yes	No	No	No

As nouns, folk is a hypernym of square-dance music; that is, folk is a word with a broader meaning than square-dance music:

square-dance music: music performed for square dancing
folk: the traditional and typically anonymous music that is an expression of the life of people in a community

Other hypernyms of square-dance music include ethnic music, folk music.

square-dance music (noun)	folk (noun)
music performed for square dancing	the traditional and typically anonymous music that is an expression of the life of people in a community
	people in general (often used in the plural)
	a social division of (usually preliterate) people
	people descended from a common ancestor