pas de deux vs terpsichore

pas de deux and terpsichore both are nouns.

Word	Noun	Adjective	Verb	Adverb
pas de deux	Yes	No	No	No
terpsichore	Yes	No	No	No

As nouns, terpsichore is a hypernym of pas de deux; that is, terpsichore is a word with a broader meaning than pas de deux:

pas de deux: (ballet) a dance for two people (usually a ballerina and a danseur noble)
terpsichore: taking a series of rhythmical steps (and movements) in time to music

Other hypernyms of pas de deux include dance, dancing, saltation.

pas de deux (noun)	terpsichore (noun)
(ballet) a dance for two people (usually a ballerina and a danseur noble)	taking a series of rhythmical steps (and movements) in time to music