clown

A person who behaves in a foolish or silly manner, often causing amusement.

"Don't be such a clown; take it seriously."

To behave in a silly or foolish way, often to amuse oneself or others.

"He likes to clown around with his friends."

An entertainer in a circus, wearing funny clothes and make-up, performing silly acts.

"The children cheered for the circus clown."