shakedown vs vampirism

shakedown

noun
  • Extortion, especially through blackmail 

  • A thorough search; a frisk 

  • A trial or test period, especially of a ship or aircraft 

  • An improvised bed. 

adj
  • that tests the performance of a ship or aircraft 

vampirism

noun
  • extortion 

  • practices associated with vampires, in particular blood-drinking and the draining of a victim's life-force. 

  • Systemic lupus erythematosus (autoimmune disease) 

  • the state of being a vampire 

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