bunkers

noun

1. 1.A hardened shelter, often buried partly or fully underground, designed to protect the inhabitants from falling bombs or other attacks.
2. 2.A large container or bin for storing coal, often built outside in the yard of a house. Now rare, as different types of fuels and energy sources are being used.
3. 3.A container for storing coal or fuel oil for a ship's engine. [Also, by extension] the quantity of fuel needed to replenish that container.
4. 4.The coal compartment on a tank engine.
5. 5.A sand-filled hollow on a golf course.