joker

A person who makes jokes.

A funny person.

A jester.

A playing card that features a picture of a joker (that is, a jester) and that may be used as a wild card in some card games.

Something kept in reserve that can be used to gain an advantage; a trump card.

Rebus decided to use their joker. 'Mr Lintz made a phone call to this office. He was talking for over twenty minutes.'

Tash Wilson played her 'joker' , pulling her chair so close our legs were almost touching. 'Hey, Chris, do you want to go out sometime? All you've got to do is say the word.'

A fictional villain of DC Comics, noted for his insanity and cunning, who either wears clown makeup or is disfigured to appear as such, and who is archenemy of Batman.

...grinning like the Joker, Batman's nemesis, a character described in the story as being a favorite of Douglas's.

He started to laugh that maniacal laugh that sounded like the Joker on speed.