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Words related to underground

un·der·ground
U u

  • hard

    not soft; solid and firm to the touch; unyielding to pressure and impenetrable or almost impenetrable.

  • hypogeum

    Ancient Architecture. the underground part of a building, as a vault.

  • subway

    Also called, especially British, tube, underground. an underground electric railroad, usually in a large city.

  • catacomb

    Catacombs are ancient underground passages and rooms, especially under a city, where people used to be buried.

  • cellar

    A cellar is a room underneath a building, which is often used for storing things in.

  • hardened

    made or become hard or harder.
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