Nouns

(n)joke, gag, laugh, jest, japea 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”
(n)jest, joke, jocularityactivity characterized by good humor
(n)antic, joke, prank, trick, caper, put-ona ludicrous or grotesque act done for fun and amusement
(n)jokea triviality not to be taken seriously“I regarded his campaign for mayor as a joke”

Verbs

(v)joke, jesttell a joke; speak humorously“He often jokes even when he appears serious”
(v)joke, jestact in a funny or teasing way