tribute vs vampirism

tribute

noun
  • Extortion; protection money. 

  • A certain proportion of the mined ore, or of its value, given to the miner as payment. 

  • A payment made by one nation to another in submission. 

  • An homage made in a body of work to another work or creator. 

  • An acknowledgment of gratitude, respect or admiration; an accompanying gift. 

  • A payment made by a feudal vassal to his lord. 

verb
  • To pay as tribute. 

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