See referee in Webster's New World Roget's A-Z Thesaurus II
noun
A person, usually appointed, who decides the issues or results, or supervises the conduct, of a competition or conflict:
arbiter, arbitrator, judge, umpire. (Sports) ref, ump. See decide
verb
To make a decision about (a controversy or dispute, for example) after deliberation, as in a court of law:
adjudge, adjudicate, arbitrate, decide, decree, determine, judge, rule, umpire. See decide, law
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