cat-o'-nine-tails vs whiplash

cat-o'-nine-tails

noun
  • A scourge (multi-tail whip) having nine, often knotted, whipcords, formerly used for flogging as naval punishment. 

  • A similarly constructed leather nine-tail whip, as used in British penal colonies and certain armies. 

whiplash

noun
  • The lash of a whip. 

  • An injury to the upper spine connected to a violent jerk of the head in either a backward or forward or side to side direction, resembling the motion of a whip. 

  • An abrupt and unexpected change, or the resulting feeling of shock. 

verb
  • To jerk back and forth; to buffet. 

  • To lash as if with a whip. 

How often have the words cat-o'-nine-tails and whiplash occurred in a corpus of books? (source: Google Ngram Viewer )