party vs wedding party

party and wedding party both are nouns.

Word	Noun	Adjective	Verb	Adverb
party	Yes	No	Yes	No
wedding party	Yes	No	No	No

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

party (noun)	wedding party (noun)
an occasion on which people can assemble for social interaction and entertainment	a party of people at a wedding
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)	wedding party (verb)
have or participate in a party