pre-game vs party

pre-game and party both are nouns.

Word	Noun	Adjective	Verb	Adverb
pre-game	Yes	No	No	No
party	Yes	No	Yes	No

As nouns, party is a hypernym of pre-game; that is, party is a word with a broader meaning than pre-game:

pre-game: A social gathering before a party or a sports game.
party: an occasion on which people can assemble for social interaction and entertainment

pre-game (noun)	party (noun)
A social gathering before a party or a sports game.	an occasion on which people can assemble for social interaction and entertainment
	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

pre-game (verb)	party (verb)
	have or participate in a party