The term 'small bomb' can be summarized by two crossword solutions: 'GRENADE' and 'petard'. A GRENADE is a small explosive device that is thrown by hand or launched from a rifle. It is typically used in military operations to clear obstacles or create diversions. A petard is an obsolete type of bomb that was used in siege warfare. It was designed to be placed against a wall or gate and then detonated, causing the wall or gate to collapse.