rock band vs dance orchestra

rock band and dance orchestra both are nouns.

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

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

Other hypernyms of rock band include band, dance band.

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