valse vs ballroom dance

valse and ballroom dance both are nouns.

Word	Noun	Adjective	Verb	Adverb
valse	Yes	No	No	No
ballroom dance	Yes	No	No	No

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

valse: a ballroom dance in triple time with a strong accent on the first beat
ballroom dance: any of a variety of social dances performed by couples in a ballroom

Other hypernyms of valse include ballroom dancing.

valse (noun)	ballroom dance (noun)
a ballroom dance in triple time with a strong accent on the first beat	any of a variety of social dances performed by couples in a ballroom