#topmast  the mast next above a lower mast and topmost in a fore-and-aft rig
  supertype:  #mast  a vertical spar for supporting sails
  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 #topmast; click here to add one.