cat-o'-nine-tails vs rawhide

cat-o'-nine-tails

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

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

rawhide

noun
  • A whip made from twisted untanned leather. 

  • Untanned hide. 

verb
  • To clear (a pump) of sediment by starting and stopping it repeatedly. 

  • To beat with a rawhide whip. 

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