party vs soiree

party and soiree both are nouns.

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

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

party: a gathering of people for pleasure
soiree: a party of people assembled in the evening (usually at a private house)

party (noun)	soiree (noun)
an occasion on which people can assemble for social interaction and entertainment	a party of people assembled in the evening (usually at a private house)
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)	soiree (verb)
have or participate in a party