The term 'PRANKSTER's Weapon' can be solved by the 10-letter word 'Peashooter'. A peashooter is a toy weapon that shoots small pieces of dried peas, often used in pranks. It is usually made from a hollow tube, such as a cardboard paper towel roll, with a narrow end to blow through. The pea is placed at the other end and when the user blows into the tube, the pea is propelled out. Peashooters are popular among children and adults alike for their simplicity and ease of use.