photo op vs social function

photo op and social function both are nouns.

Word	Noun	Adjective	Verb	Adverb
photo op	Yes	No	No	No
social function	Yes	No	No	No

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

photo op: an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed
social function: a formal or official social gathering or ceremony of people

Other hypernyms of photo op include affair, function, occasion, social affair, social gathering, social occasion.

photo op (noun)	social function (noun)
an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed	a formal or official social gathering or ceremony of people