BOB vs elevated

BOB

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. 

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

elevated

adj
  • Of a higher register or style. 

  • Of a higher rank or status. 

  • Raised, particularly above ground level. 

  • Running with administrator rights. 

  • Increased, particularly above a normal level. 

noun
  • An elevated railway. 

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