BOB vs gasper

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. 

gasper

noun
  • One who is aroused by autoasphyxiation. 

  • Something that causes one to gasp in shock, suspense, or awe. 

  • A cigarette. 

  • An adjustable air outlet over a passenger seat in aircraft. 

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