bolero vs dance music

bolero and dance music both are nouns.

Word	Noun	Adjective	Verb	Adverb
bolero	Yes	No	No	No
dance music	Yes	No	No	No

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

bolero (noun)	dance music (noun)
a Spanish dance in triple time accompanied by guitar and castanets	music to dance to
a short jacket; worn mostly by women	a genre of popular music composed for ballroom dancing
music written in the rhythm of the bolero dance