1) Arbitrator 2) Conciliator 3) Intermediary 4) Intermediator 5) Interpreter 6) Matcher 7) Matchmaker 8) Mediator 9) Mediatrix 10) Pacifier 11) Peacemaker 12) Reconciler 1) Go-between 2) Intermediary 3) Intermediator 4) Mediator 5) Negotiant 6) Negotiator 7) Treater 
• (n.) A bishop, who, during a vacancy of the see, administers the bishopric till a successor is installed. • (n.) One who goes between, or intercedes; a mediator. (a) One who interposes between parties at variance, with a view to reconcile them. (b) One who pleads in behalf of another.
In`ter·ces'sor noun [ Latin , a surety: confer French intercesseur .] 1. One who goes between, or intercedes; a mediator. (a) One who interposes between parties at variance, with a view to reconcile them. (b) One who pleads in behalf of another. Milton. 2. ...
a person who intercedes.