0 No, they are not interchangeable. Although they may serve the same or similar function, each sport has decided whether to call them referee, umpire, or any other name. That is then there official title and you should use the relevant one for each sport. 0-
0 In 01b00tennis 02b00you have:02br 02br 00 the 01b00chair umpire02b00 (the guy taking direct decisions, announcing the score and sitting up there on the ladder)02br 02br 00 the 01b00tournament referee02b00: he's outside the court, an observer, called upon in case of conflict0-