cat-o'-nine-tails vs sjambok

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. 

sjambok

noun
  • A stout whip, especially made of rhinoceros or hippopotamus hide. 

verb
  • To whip with a sjambok; to horsewhip. 

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