What are the officials called in badminton?

Tennis officials are referred to by their function during a tennis match. A tennis official who watches for "out" balls on the baseline would be referred to as a "baseline judge" or "line judge" or "line umpire" or "linesman". A linesman who watches for "out" balls during the serve may be referred to as the "service linesman/umpire". Though rarely used, anymore, a line judge who sits near the net to determine whether a served ball hits the net (i.e., a "net" or "let" call) is a "net judge". The "chair umpire" is the primary "line judge", and may overrule the other linesmen. There is also a tennis official called a "(tournament or court) supervisor", who is only seen when there is a problem on the court, such as potentially bad weather, darkness, medical problems, or otherwise called on by the chair umpire or by a player, though it is very rare that this ever occurs. Generally speaking, the supervisor does not interfere with or overrule calls made by the chair umpire. In amateur USTA matches, a "Roving Umpire" or "Rover" performs all these duties, though he/she is intended to resolve problems or questions, not make line calls. For further information, refer to the 2009 USTA "Friend at Court" link, below.