The term 'used a stun gun on' can be summarized by two crossword solutions: 'Tasered' (7 letters) and 'Tased' (5 letters). Taser is a brand of conducted electrical weapon (CEW) that is used to incapacitate a person by delivering an electric shock. It is commonly used by law enforcement officers to subdue suspects who are resisting arrest or otherwise not complying with orders. Tasing is the act of using a Taser on someone.