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                                A literary term in which:
a joke exploits the different possible meanings of a word or the fact that there are words that sound alike but have different meanings.
GIVE AN EXAMPLE FROM THE PLAY
                                A pun. 
Mercutio--"Nay, gentle Romeo, we must have you dance." 
Romeo--"Not I, believe me. You have dancing shoes / With nimble soles; I have a soul of lead…"(I iv 13-5) 
Romeo has used the word "sole" when referring to Mercutio's shoes, then made a pun by referring to his own "soul."