#pontoon.barge  a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge
  supertype:  barge__flatboat__hoy__lighter  a boat with a flat bottom for carrying heavy loads (especially on canals)
  part of:  pontoon_bridge__pontoonbridge__bateau_bridge__floating_bridge  a temporary bridge built over a series of pontoons

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