Jester
Part of speech: noun
Definition: one who jests, jokes or mocks a person in bright garb and fool's cap who amused a mediaeval royal court.
Harlequin
Part of speech: noun
Definition: a pantomime clown, typically dressed in checkered clothes
Part of speech: adjective
Definition: brightly coloured, especially in a pattern like that of a harlequin clown's clothes