Acting as a mediator means facilitating communication between two parties to reach a resolution. There are several synonyms for "act as a mediator" that convey the same meaning and can be used in different contexts. "Mediate," "interpose," "negotiate," "resolve," "facilitate," and "arbitrate" are some of the commonly used synonyms for this term. Each word carries a slightly different connotation but ultimately refers to the act of bringing two parties together for constructive discussion. Whichever synonym you choose, it is important to approach the role of a mediator with empathy, impartiality, and strong communication skills to effectively bridge the gap between conflicting parties.