social affair vs affair

social affair and affair both are nouns.

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

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

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

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

social affair (noun)	affair (noun)
a formal or official social gathering or ceremony of people	a vaguely specified concern
	a formal or official social gathering or ceremony of people
	a usually secretive or illicit sexual relationship