Reciprocators are individuals who reciprocate or respond to an action or gesture in a similar fashion. Some synonyms for reciprocators include responders, returners, paybackers, correspondents, and mutualists. Responder refers to someone who reacts or responds to something in a constructive manner. Returner means someone who gives back in a similar fashion. Paybacker indicates someone who delivers a particular act to return a favour. Correspondent refers to someone who responds to an action in an appropriate manner. Finally, mutualist indicates someone who reciprocates in a mutual relationship. In essence, these synonyms mean the same thing and are interchangeable in most contexts.