Part of speech: Noun
someone chosen to judge and decide a disputed issue
Example: the critic was considered to be an arbiter of modern literature; the arbitrator's authority derived from the consent of the disputants; an umpire was appointed to settle the tax case
Part of speech: Noun
someone with the power to settle matters at will
Example: she was the final arbiter on all matters of fashion
Arbiter, Arbitrator, Umpire, Supreme authority