#wallboard  thin sheet used to cover walls or partitions
  supertype:  #flat_solid__sheet  a flat artifact that is thin relative to its length and width
  subtype:  #beaver_board  a light wallboard made of compressed wood pulp
  subtype:  #fiberboard__fibreboard__particle_board  wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets
     subtype:  #Masonite  (trademark) a type of fiberboard
  subtype:  #plasterboard__gypsum_board  wallboard with a gypsum plaster core bounded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls
     subtype:  #Sheetrock  (trademark) a kind of plasterboard

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