clown(noun, verb) noun1. a rude or vulgar foolSimilar word(s): buffoonDefinition categories: person, fool, muggins, sap, saphead, tomfool2. a person who amuses others by ridiculous behaviorSimilar word(s): buffoon, goof, goofballDefinition categories: person, comedian, comic verb1. act as or like a clownSimilar word(s): anticDefinition categories: body, jest, joke