referee

(noun) (sports) the chief official (as in boxing or American football) who is expected to ensure fair play. Synonyms: ref.

(noun) someone who reads manuscripts and judges their suitability for publication. Synonyms: reviewer, reader.

(noun) an attorney appointed by a court to investigate and report on a case.

(verb) be a referee or umpire in a sports competition. Synonyms: umpire.

(verb) evaluate professionally a colleague's work. Synonyms: peer review.