party vs social occasion

party and social occasion both are nouns.

Word	Noun	Adjective	Verb	Adverb
party	Yes	No	Yes	No
social occasion	Yes	No	No	No

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

party: an occasion on which people can assemble for social interaction and entertainment
social occasion: a formal or official social gathering or ceremony of people

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

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

party: a gathering of people for pleasure
social occasion: a formal or official social gathering or ceremony of people

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

party (noun)	social occasion (noun)
an occasion on which people can assemble for social interaction and entertainment	a formal or official social gathering or ceremony of people
a gathering of people for pleasure
an organization to gain political power
a band of people associated temporarily in some activity
a person involved in legal proceedings

party (verb)	social occasion (verb)
have or participate in a party