#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

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