slapper
1. [ noun ] a hitter who slaps (usually another person) with an open hand
Synonyms: spanker
Examples:

"someone slapped me on the back and I turned to see who the slapper was" "my father was the designated spanker in our family"

Related terms: hitter spank
Similar spelling:   slipper
  slippery
  slippered
  sleeper
  sleepers
  Slover
  sliver
  Slifer
  slaver
  slobber
  slivery
  slavery
  slabber
  slip_road
  slip_ring