Clown
Part of speech: noun
Definition: A performance artist often associated with a circus and typically characterised by bright, oversized clothing, a red nose, face paint, and a brightly colored wig and who performs slapstick. A person who acts in a silly fashion.
Part of speech: verb
Definition: (also clown about (British) or clown around) To act in a silly fashion.
Example sentence: I had a friend who was a clown. When he died, all his friends went to the funeral in one car.
Buffoon
Part of speech: verb
Definition: To behave like a buffoon
Part of speech: noun
Definition: One who acts in a silly or ridiculous fashion; a clown or fool.An unintentionally ridiculous person.