"Negotiatrix" is a relatively uncommon word that refers to a female negotiator. There are several other synonyms that can be used in place of this term, including "negotiator," "mediator," "arbitrator," "intermediary," "facilitator," and "delegate." Each of these words refers to someone who is tasked with negotiating or mediating a conversation or dispute between two or more parties. Depending on the context in which they are used, these words may have slightly different connotations. However, they are all appropriate alternatives to "negotiatrix" when referring to a woman who is skilled at negotiating and resolving conflicts.