joke
jest
act in a funny or teasing way
jocularity
activity characterized by good humor
tell a joke; speak humorously
He often jokes even when he appears serious
gag
laugh
jape
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