Slave : (especially in the past) a person who is the legal property of another and is forced to obey them. Enthusiast : a person who is very interested in a particular activity or subject. Clown : a comic entertainer, especially one in a circus, wearing a traditional costume and exaggerated make-up. Simpleton : a foolish or gullible person. Buff : a person who is enthusiastically interested in and very knowledgeable about a particular subject.