cat-o'-nine-tails vs scourge

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. 

scourge

noun
  • A whip, often of leather and often multi-tailed. 

  • A source of persistent trouble such as pestilence that causes pain and suffering or widespread destruction. 

  • A means to inflict such pain or destruction. 

verb
  • To strike with a scourge; to flog. 

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