intervenor vs intervene

intervenor is a noun but intervene is not a noun.

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

intervenor (noun)	intervene (noun)
(law) a party who interposes in a pending proceeding

intervenor (verb)	intervene (verb)
	occur between other event or between certain points of time
	get involved, so as to alter or hinder an action, or through force or threat of force
	be placed or located between other things or extend between spaces and events