referee
nounUK /ˌref.əˈriː/
US /ˌref.əˈriː/
A referee is a person who makes sure players follow the rules in a game.
The referee blew the whistle when the player touched the ball with his hand.
OTHER MEANINGS
2. A person who reads and judges papers submitted to a journal or competition.
Each paper was sent to two referees before publication.
3. A person who gives a reference for someone applying for a job.
She listed her old boss as a referee on her application.
4. To act as the official in charge of a game.
He refereed the football match on Saturday.