taxi dancer vs dancer

taxi dancer and dancer both are nouns.

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

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

taxi dancer: a woman employed to dance with patrons who pay a fee for each dance
dancer: a performer who dances professionally

Other hypernyms of taxi dancer include professional dancer, terpsichorean.

taxi dancer (noun)	dancer (noun)
a woman employed to dance with patrons who pay a fee for each dance	a performer who dances professionally
	a person who participates in a social gathering arranged for dancing (as a ball)