big band vs dance orchestra

big band and dance orchestra both are nouns.

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

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

big band: a large dance or jazz band usually featuring improvised solos by lead musicians
dance orchestra: a group of musicians playing popular music for dancing

Other hypernyms of big band include band, dance band.

big band (noun)	dance orchestra (noun)
a large dance or jazz band usually featuring improvised solos by lead musicians	a group of musicians playing popular music for dancing