BOB vs vestal

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. 

vestal

noun
  • A female virgin; a woman who has never had sexual relations. 

  • A virgin consecrated to Vesta, and to the service of watching the sacred fire, which was to be perpetually kept burning upon her altar; a vestal virgin. 

  • A nun. 

adj
  • Of or pertaining to Vesta, the virgin goddess of the hearth. 

  • Pure; chaste. 

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