party vs assignor

party and assignor both are nouns.

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

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

party (noun)	assignor (noun)
an occasion on which people can assemble for social interaction and entertainment	(law) the party who makes an assignment
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)	assignor (verb)
have or participate in a party