observance vs social function

observance and social function both are nouns.

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

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

observance: a formal event performed on a special occasion
social function: a formal or official social gathering or ceremony of people

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

observance (noun)	social function (noun)
the act of observing; taking a patient look	a formal or official social gathering or ceremony of people
conformity with law or custom or practice etc.
the act of noticing or paying attention
a formal event performed on a special occasion