turret
US /ˈtʌr.ət/
UK /ˈtʌr.ət/
1.
a small tower on top of a larger tower or at the corner of a building or wall, especially of a castle
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The castle had several defensive turrets.
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From the turret, she could see the entire valley.
2.
a low, flat, rotating structure, typically on a tank or warship, from which guns are fired
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The tank's turret rotated to aim at the target.
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The battleship was equipped with multiple gun turrets.