#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

No statement uses or specializes mast; click here to add one.