#screw_propeller__screw  a propeller with several angled blades that rotates to push against water or air
  supertype:  #propeller__propellor  a mechanical device that rotates to push against air or water
  part of:  #outboard_motor__outboard  internal-combustion engine that mounts at stern of small boat
  part of:  #ship  a vessel that carries passengers or freight

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