bunker
n//ˈbʌŋk.əː//bunker, bunkra
(military) A hardened shelter, often partly buried or fully underground, designed to protect the inhabitants from falling bombs or other attacks.
(nautical) A compartment for storing coal for the ship's boilers; or a tank for storing fuel oil for the ship's engines.
(golf) A hazard on a golf course consisting of a sand-filled hollow.
(Britain, chiefly, historical) A large bin or container for storing coal, often built outdoors in the yard of a house.
(transitive) To load (a vessel) with coal or fuel oil for the engine.