BOB vs garrote

BOB

noun
  • Vibrator (device designed to stimulate a woman's genitals). 

adj
  • Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher. 

garrote

noun
  • something, especially a cord or wire, used for strangulation 

  • an iron collar formerly used in Spain to execute people by strangulation 

verb
  • to execute by strangulation 

  • to kill using a garrote 

How often have the words BOB and garrote occurred in a corpus of books? (source: Google Ngram Viewer )