The term 'BOMB PART' refers to the three components of a bomb: a FUSE (4 letters), a DETONATOR (9 letters), and a TIMER (5 letters). A FUSE is a device that ignites an explosive material, such as gunpowder, when it is heated or struck. A DETONATOR is a device that sets off an explosive charge, usually by means of an electric current. A TIMER is a device that can be set to activate an explosive device at a predetermined time. Together, these three components form the essential parts of a bomb.