A dispute settler is a person who resolves disagreements between two or more parties. An UMP is a three-letter acronym for an umpire, which is a person who makes decisions in sports and other competitions. A MEDIATOR is an eight-letter term for someone who helps two or more parties reach a mutually acceptable agreement. An ARBITER is a seven-letter term for someone who settles a dispute by making a binding decision. Finally, a DUEL is a four-letter term for a fight between two people, usually with weapons. All of these terms refer to different ways of settling disputes between two or more parties.