cat-o'-nine-tails vs spank

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. 

spank

noun
  • An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap. 

  • A slapping sound, as produced by spanking. 

verb
  • To move rapidly. 

  • To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, gesture, or form of sexual interaction. 

  • To hit very hard. 

  • To soundly defeat, to trounce. 

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