headbutter

noun

1. One who headbutts.

   “She was a headbutter, a button- pusher.”

   “Now meet the king of the headbutters: Pachycephalosaurus. This dinosaur was the largest of a group sometimes called "thick-headed lizards," which had specially thick skulls that were used for head-butting contests.”

   “Good kickers could help with soccer practices; skilled headbutters could become champion goalies.”