turret
//ˈtʌrɪt//
Noun
turretSingular
turretsPlural
1
A small tower, especially one projecting from the wall or corner of a building such as a castle.
The old castle had four turrets at each corner.
2
A rotating armored structure on a military vehicle, ship, or aircraft that houses guns and their operators.
The tank's turret rotated to aim at the target.