#firewood  wood used for fuel; "they collected and cut their own firewood"
  supertype:  fuel__combustible__combustiblematerial  a substance that can be burned to provide heat or power; "more fuel is needed during the winter months"; "they developed alternative fuels for aircraft"
  subtype:  cordwood  firewood cut and stacked in cords; wood sold by the cord
  subtype:  backlog.firewood  large log at the back of a hearth fire
     subtype:  Yule_log  large log traditionally burned at Christmas
  subtype:  firebrand__brand  a piece of wood that has been burned or is burning
  subtype:  pine_knot  a joint of pine wood used for fuel

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