supper vs social occasion

supper and social occasion both are nouns.

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

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

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

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

supper (noun)	social occasion (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