supper vs social gathering

supper and social gathering both are nouns.

Word	Noun	Adjective	Verb	Adverb
supper	Yes	No	No	No
social gathering	Yes	No	No	No

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

supper: a social gathering where a light evening meal is served
social gathering: a formal or official social gathering or ceremony of people

Other hypernyms of supper include affair, function, occasion, social affair, social function, social occasion.

supper (noun)	social gathering (noun)
a light evening meal; served in early evening if dinner is at midday or served late in the evening at bedtime	a formal or official social gathering or ceremony of people
a social gathering where a light evening meal is served