rock band vs dance band

rock band and dance band both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock band	Yes	No	No	No
dance band	Yes	No	No	No

As nouns, dance band is a hypernym of rock band; that is, dance band is a word with a broader meaning than rock band:

Other hypernyms of rock band include band, dance orchestra.

rock band (noun)	dance band (noun)
a band of musicians who play rock'n'roll music	a group of musicians playing popular music for dancing