party vs search party

party and search party both are nouns.

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

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

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