assignor vs party

assignor and party both are nouns.

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

As nouns, party is a hypernym of assignor; that is, party is a word with a broader meaning than assignor:

assignor (noun)	party (noun)
(law) the party who makes an assignment	an occasion on which people can assemble for social interaction and entertainment
	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

assignor (verb)	party (verb)
	have or participate in a party