#axletree  a dead axle on a carriage or wagon that has terminal spindles on which the wheel revolve
  supertype:  #dead_axle  an axle that carries a wheel but without power to drive it
  subtype:  #axle_bar  an iron bar that serves as an axletree
  part of:  #equipage__carriage__rig  a wheeled vehicle drawn by horses
  part of:  #cart  a heavy open wagon usually having two wheels and drawn by an animal
  part of:  #wagon__waggon  any of various kinds of wheeled vehicles drawn by a horse or tractor

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