arbiter Hear it.
noun ar·bi·ter \ ˈär-bə-tər \
1: a person with power to decide a dispute :judge
- The mayor will act as the final arbiterin any dispute between board members.
2: a person or agency whose judgment or opinion is considered authoritative
- arbiters of taste
arbitrator is a person chosen to settle differences in a disagreement
arbitration is the act of judging, or serving as an arbiter.
arbitrary is “existing or coming about seemingly at random or by chance or as a capricious and unreasonable act of will,”
Synonyms: mediator, judge, conciliator, intercessor, intermediary, middleman, peacemaker, referee, umpire, negotiator
Antonyms: agitator, anarchist, instigator, confronter, tattletale, rival, troublemaker, fighter, player, bomber
Suffix: -s, -able, -ate, -ration,