The term Special Messenger is often associated with a specific type of courier or delivery service used for important or urgent messages. However, there are various other synonyms that can be used to refer to this type of person or service. Some of the most common ones include courier, emissary, envoy, runner, go-between, messenger, dispatcher, agent, carrier, and postman. Depending on the context and purpose of the delivery, some of these synonyms may be more appropriate than others. For example, a postman would typically deliver mail and packages, while an envoy might be dispatched on a diplomatic mission.