arbitrative vs arbitration

arbitrative is not a noun while arbitration is a noun.

Word	Noun	Adjective	Verb	Adverb
arbitrative	No	Yes	No	No
arbitration	Yes	No	No	No

arbitrative (noun)	arbitration (noun)
	the act of deciding as an arbiter; giving authoritative judgment
	(law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management)

arbitrative (adjective)	arbitration (adjective)
relating to or having the authority to arbitrate