#watt-hour  a unit of energy equal to the power of one watt operating for one hour
  supertype:  work_unit__heat_unit__energy_unit  a unit of measurement for work
  part of:  kilowatt_hour__kW-hr__Board_of_Trade_unit__B.T.U.  a unit of energy equal to the work done by a power of 1000 watts operating for one hour

No statement uses or specializes watt-hour; click here to add one.