referee

ot noun

1. An umpire or judge; an official who makes sure the rules are followed during a game. The referee kicked Jim out of the game for fighting.
2. A person who writes a letter of reference or provides a reference by phone call for someone. Your application, along with letters from three referees, should be received by January 31.
3. A person who settles a dispute.
4. An expert who judges the manuscript of an article or book to decide if it should be published.

fe’l verb

1. To act as a referee. He has to referee three hockey games this weekend.