Joke
WordNet
noun
(1) A ludicrous or grotesque act done for fun and amusement
(2) Activity characterized by good humor
(3) A triviality not to be taken seriously
"I regarded his campaign for mayor as a joke"
(4) A humorous anecdote or remark intended to provoke laughter
"He told a very funny joke"
"He knows a million gags"
"Thanks for the laugh"
"He laughed unpleasantly at his own jest"
"Even a schoolboy's jape is supposed to have some ascertainable point"
verb
(5) Act in a funny or teasing way
(6) Tell a joke; speak humorously
"He often jokes even when he appears serious"