wedding party vs wedding

wedding party and wedding both are nouns.

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

As nouns, wedding party and wedding are synonyms defined as:

wedding party (noun)	wedding (noun)
a party of people at a wedding	the act of marrying; the nuptial ceremony
	the social event at which the ceremony of marriage is performed
	a party of people at a wedding