supper club vs nightclub

supper club and nightclub both are nouns.

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

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

supper club: usually a small luxurious nightclub
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

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

supper club (noun)	nightclub (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