2. Noun. a gun with electrically powered components, such as the reloader, or barrel rotator ¹
3. Noun. a gun that uses electricity to vaporize water as the propulsive force on the ballistic projectile ¹
4. Noun. a gun that uses electromagnetic, electric or magnetic force to propel a projectile ¹
5. Noun. a railgun ¹
6. Noun. a coilgun ¹
¹ Source: wiktionary.com