party vs pre-game

party and pre-game both are nouns.

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

As nouns, pre-game is a hyponym of party; that is, pre-game is a word with a more specific, narrower meaning than party:

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

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