We don't have synonyms for arbitor yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are arbiter.
°A person appointed, or chosen, by parties to determine a controversy between them; an arbitrator.
°(With of) Any person who has the power of judging and determining, or ordaining, without control; one whose power of deciding and governing is not limited.
"Television and film, not Vogue'' and similar magazines, are the arbiters of fashion."
°A person appointed, or chosen, by parties to determine a controversy between them; an arbitrator.
°(With of) Any person who has the power of judging and determining, or ordaining, without control; one whose power of deciding and governing is not limited.
"Television and film, not Vogue'' and similar magazines, are the arbiters of fashion."