Чем отличается "referee" от "umpire"?
В разных видах спорта по-разному называют. Арбитр, рефери, судья. Tennis--Both Football--Referee Baseball--umpire Hockey--Referee Basketball--Referee
общий принцип: referee перемещается по полю, umpire в основном остается примерно на одном месте.
а по видам спорта, вот надергал:
(tennis) The official who presides over a tennis game sat on a high chair.
(cricket) One of the two white-coated officials who preside over a cricket match.
(baseball) One of usually 4 officials who preside over a baseball game.
The umpire called the pitch a strike.
(American football) The official who stands behind the line on the defensive side.
The umpire must keep on his toes as the play often occurs around him.
(Australian rules football) A match official on the ground deciding and enforcing the rules during play. As of 2007 the Australian Football League uses 3, or in the past 2 or just 1. The other officials, the goal umpires and boundary umpires, are normally not called just umpires alone.