The word 使者 is formed by combining two characters: 使, which means "to use", "to cause", or more specifically "to send on a mission", with 者, a character that denotes a person who performs a specific action or role. Conceptually, they fuse together to create the meaning of "the one who is sent", or "the person carrying out a mission", directly giving us the meaning of an emissary, envoy, or messenger. It is a straightforward structural pairing where the first character defines the action or purpose, and the second character personifies it.