What is the difference between "umpire" and "referee"?
Based on my own observation, they call the judge in ping-pong or badminton games "umpire" whereas the judge in a football match is called the referee.......

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Same role, different name.

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It depends on the sport. Tennis and cricket have umpires, for example, while football has referees.

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Umpire is used in baseball and referee is used in other sports.  Basically the same role.