bunker

1. A hardened shelter, often partly buried or fully underground, designed to protect the inhabitants from falling bombs or other attacks. · The military built a bunker to help evacuate the citizens safely from the bombings.
2. A compartment for storing coal for the ship's boilers; or a tank for storing fuel oil for the ship's engines.
3. The coal compartment on a tank engine; it can also refer to that on a tender engine.
4. A hazard on a golf course consisting of a sand-filled hollow.
5. An obstacle used to block an opposing player's view and field of fire.
6. A refrigerator or freezer, usually with an open top, used to display chilled or frozen merchandise for convenience in grocery stores.

Plural bunkers