party vs intervenor

party and intervenor both are nouns.

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

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

party (noun)	intervenor (noun)
an occasion on which people can assemble for social interaction and entertainment	(law) a party who interposes in a pending proceeding
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)	intervenor (verb)
have or participate in a party