* Spokesperson: This is a common and general term for someone who represents a group or organization.
* Advocate: This term implies someone who speaks up for a cause or a person, often in a legal or political setting.
* Representative: This word emphasizes the role of acting on behalf of another person or group.
* Proxy: This term refers to someone who acts as a substitute for another person, often in a legal or business context.
* Interpreter: This word specifically describes someone who translates language for another person.
* Mediator: This term is used for someone who facilitates communication between two parties who are in conflict.
The best word to use will depend on the specific situation and the nuances of the role.