valse vs ballroom dancing

valse and ballroom dancing both are nouns.

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

As nouns, ballroom dancing is a hypernym of valse; that is, ballroom dancing 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 dancing: any of a variety of social dances performed by couples in a ballroom

Other hypernyms of valse include ballroom dance.

valse (noun)	ballroom dancing (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