How to Say "arbitrator" in Spanish
The Spanish word for “arbitrator” is “árbitro” — B2 level.

Examples
Las empresas nombraron a un árbitro para resolver el contrato.
The companies appointed an arbitrator to resolve the contract.
Mi abuelo siempre era el árbitro en las discusiones familiares.
My grandfather was always the mediator in family arguments.
Él se considera el árbitro supremo de la moda en esta ciudad.
He considers himself the supreme judge of fashion in this city.
Abstract usage
When used outside of sports, this word describes a role rather than just a person. It implies that the person has the final authority to make a decision.
Confusing with 'Arbitrario'
Mistake: “Su decisión fue muy árbitro.”
Correction: Su decisión fue muy arbitraria. Use 'árbitro' for the person, and 'arbitrario/a' (arbitrary) for an unfair or random decision.
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