Synonyms to ump

umpire, JP, Justice, act between, adjudge, adjudicate, adjudicator, arbiter, arbitrate, arbitrator, bargain, bencher, critic, go between, hear, his honor, his lordship, his worship, hold court, hold the scales, impartial arbitrator, indicator, intercede, intermediate, interpose, intervene, judge, judger, justice, magistrate, make terms, mediate, meet halfway, moderate, moderator, negotiate, official, officiate, referee, represent, sit in judgment, step in, third party, treat with, try, unbiased observer