exaction vs vampirism

exaction

noun
  • extortion. 

  • The act of demanding with authority, and compelling to pay or yield; compulsion to give or furnish; a levying by force 

  • That which is exacted; a severe tribute; a fee, reward, or contribution, demanded or levied with severity or injustice. 

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 exaction and vampirism occurred in a corpus of books? (source: Google Ngram Viewer )