fundraiser vs social function

fundraiser and social function both are nouns.

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

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

fundraiser: a social function that is held for the purpose of raising money
social function: a formal or official social gathering or ceremony of people

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

fundraiser (noun)	social function (noun)
a social function that is held for the purpose of raising money	a formal or official social gathering or ceremony of people
someone who solicits financial contributions