Synonyms for Joke (same or very similar meaning)
WordNet sense 1 (a humorous anecdote or remark intended to provoke laughter):
gag, jape, jest, laughWordNet sense 2 (activity characterized by good humor):
jocularityWordNet sense 3 (a ludicrous or grotesque act done for fun and amusement):
antic, caper, prank, put-on, trickFrom the ODE community, based on WordNetadd/edit