waltzer vs dancer

waltzer and dancer both are nouns.

Word	Noun	Adjective	Verb	Adverb
waltzer	Yes	No	No	No
dancer	Yes	No	No	No

As nouns, dancer is a hypernym of waltzer; that is, dancer is a word with a broader meaning than waltzer:

waltzer: a dancer who waltzes
dancer: a person who participates in a social gathering arranged for dancing (as a ball)

Other hypernyms of waltzer include social dancer.

waltzer (noun)	dancer (noun)
a dancer who waltzes	a performer who dances professionally
	a person who participates in a social gathering arranged for dancing (as a ball)