#mast  a vertical spar for supporting sails
  supertype:  #spar  a stout rounded pole of wood or metal used to support rigging
  part:  #masthead
  part of:  #sailing_vessel
  subtype:  #foremast  the mast nearest the bow in vessels with two or more masts
  subtype:  #jiggermast__jigger  any small mast on a sailing vessel; especially the mizzenmast of a yawl
  subtype:  #jury_mast  a temporary mast to replace one that has broken off
  subtype:  #mainmast  the chief mast of a sailing vessel with two or more masts
  subtype:  #mizzenmast__mizenmast__mizzen__mizen  third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
  subtype:  #topmast  the mast next above a lower mast and topmost in a fore-and-aft rig
     subtype:  #fore-topmast  the topmast next above the foremast
     subtype:  #main-topmast  the topmast next above the mainmast
     subtype:  #royal_mast__royalmast  topmast immediately above the topgallant mast
     subtype:  #topgallant_mast__topgallant  a mast fixed to the head of a topmast on a square-rigged vessel

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