social affair vs social function

social affair and social function both are nouns.

Word	Noun	Adjective	Verb	Adverb
social affair	Yes	No	No	No
social function	Yes	No	No	No

As nouns, social affair and social function are synonyms defined as:

social affair and social function: a formal or official social gathering or ceremony of people

Other synonyms of social affair include affair, function, occasion, social gathering, social occasion.

social affair (noun)	social function (noun)
a formal or official social gathering or ceremony of people	a formal or official social gathering or ceremony of people