#gad__spur  a sharp prod fixed to a rider's heel and used to urge a horse onward; "cowboys know not to squat with their spurs on"
  supertype:  prod__goad  a pointed instrument used to prod into motion
  part of:  boot
  part:  rowel  a small spiked wheel at the end of a spur

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