#hole.natural_depression__hollow  a depression hollowed out of solid matter
  supertype:  #natural_depression__naturaldepression__depression  a sunken or depressed geological formation
  subtype:  #burrow__tunnel  a hole in the ground made by an animal for shelter
     subtype:  #rabbit_warren.burrow__rabbitwarren__warren  a series of connected underground tunnels occupied by rabbits
  subtype:  #gopher_hole  a hole in the ground made by gophers
  subtype:  #cavity__pit  a sizeable hole (usually in the ground); "they dug a pit to bury the body"
     subtype:  #barbecue_pit  a pit where wood or charcoal is burned to make a bed of hot coals suitable for barbecuing meat
     subtype:  #borrow_pit  a pit created to provide earth that can be used as fill at another site
     subtype:  #divot.cavity  (golf) the cavity left when a piece of turf is cut from the ground by the club head in making a stroke; "it was a good drive but the ball ended up in a divot"
     subtype:  #fire_pit  a pit whose floor is incandescent lava; "the fire pit of the crater"
     subtype:  #quicksand  a pit filled with loose wet sand into which heavy objects sink
     subtype:  #sandpit  a large pit in sandy ground from which sand is dug
     subtype:  #sawpit  a pit over which lumber is positioned to be sawed by two men with a long two-handled saw
     subtype:  #tar_pit__tarpit  a natural accumulation of bitumens at the surface of the earth; often acts as a trap for animals whose bones are thus preserved
  subtype:  #pothole__chuckhole  a pit or hole produced by wear or weathering (especially in a road surface)
  subtype:  #rabbit_burrow__rabbit_hole  a hole in the ground as a nest made by wild rabbits
  subtype:  #wormhole  hole made by a burrowing worm

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