#bolt.screw  a screw that screws into a nut to form a fastener
  supertype:  screw  a fastener with a tapered threaded shank and a slotted head
  subtype:  carriage_bolt  expansion_bolt  kingbolt  machine_bolt  stove_bolt
  part of:  nut_and_bolt
  part:  head.projection  a projection out from one end; "the head of the nail", "a pinhead is the head of a pin"
  part:  bolt_shank__shank  cylinder forming the part of a bolt between the thread and the head

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