dancer vs terpsichorean

dancer and terpsichorean both are nouns.

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

As nouns, dancer and terpsichorean are synonyms defined as:

Other synonyms of dancer include professional dancer.

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

dancer (adjective)	terpsichorean (adjective)
	of or relating to dancing