ceremony vs social affair

ceremony and social affair both are nouns.

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

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

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

ceremony (noun)	social affair (noun)
the proper or conventional behavior on some solemn occasion	a formal or official social gathering or ceremony of people
any activity that is performed in an especially solemn elaborate or formal way
a formal event performed on a special occasion