arbitration vs arbitrament

arbitration and arbitrament both are nouns.

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

As nouns, arbitration and arbitrament are synonyms defined as:

arbitration and arbitrament: the act of deciding as an arbiter; giving authoritative judgment

Other synonyms of arbitration include arbitrement.

arbitration (noun)	arbitrament (noun)
the act of deciding as an arbiter; giving authoritative judgment	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)