#cask__barrel  a cylindrical container that holds liquids
  supertype:  #vessel  an object used as a container (especially for liquids)
  part:  #breech  #bung  #hoop.band  #lag  #spigot
  subtype:  #beer_barrel__beer_keg  a barrel that holds beer
  subtype:  #butt  a large cask (especially one holding a volume equivalent to 2 hogsheads or 126 gallons)
     subtype:  #water_butt__waterbutt  a butt set on end to contain water especially to store rainwater
  subtype:  #hogshead  a large cask especially one holding 63 gals
  subtype:  #keg  small cask or barrel
     subtype:  #firkin  a small wooden keg
     subtype:  #powder_keg  keg (usually made of metal) for gunpowder or blasting powder
  subtype:  #pickle_barrel  a barrel holding vinegar in which cucumbers are pickled
  subtype:  #shook  a disassembled barrel; the parts packed for storage or shipment
  subtype:  #tun  a large cask especially one holding a volume equivalent to 2 butts or 252 gals
  subtype:  #wine_cask__wine_barrel  a barrel that holds wine

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