supper club vs nightspot

supper club and nightspot both are nouns.

Word	Noun	Adjective	Verb	Adverb
supper club	Yes	No	No	No
nightspot	Yes	No	No	No

As nouns, nightspot is a hypernym of supper club; that is, nightspot is a word with a broader meaning than supper club:

supper club: usually a small luxurious nightclub
nightspot: a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink

Other hypernyms of supper club include cabaret, club, night club, nightclub.

supper club (noun)	nightspot (noun)
usually a small luxurious nightclub	a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink