The best replacement for arbitrator is arbiter.

The best alternatives to arbitrator are rated as following:
★★★★★  arbiter
★★★★  mediator
★★★  omen
★★★  judge
★★  independent expert
★★  vexor
★★  expert
★  adjudicator
★  maller
★  thorax
  umpire
  sword of the dun banner
  omen eve

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