refereeverb
Ray Blanding will be umpiring the first game of the little league series.
Julian had never umpired a cricket match before.
Palermo can't umpire anymore.

SMART Vocabulary: related words and phrases

Refereeing & judging in sport
adjudicate
adjudication
adjudicator
assistant referee
booking
cooler
crew chief
fair play
linesman
official scorer
penalty flag
ref
regulation game
regulation time
replay review
score
scorer
umpire
video technology
yellow card