What is another word for "arbitrator"?

Roget's Thesaurus (1911) lists these synonyms for "arbitrator": accusation, adjudge, advocate, agent, ambassador, arbiter, arbitrate, arbitration, archon, assessor, assistant, assize, attache, attorney, auctioneer, bagman, bailiff, bargain, barmaster, barrister, beak, box, broker, business, cadi, case, censor, chancellor, charge, clerk, come, commercial, commissary, commission, commissionaire, commissioner, committee, common, compromise, conservator.