sadism vs savagery

sadism

noun
  • Deliberate or wanton cruelty, either mental or physical, to other people, or to animals, regardless of whether for (sexual) gratification. 

  • Achievement of sexual gratification by inflicting pain or humiliation on others, or watching pain or humiliation inflicted on others. 

  • The enjoyment of inflicting pain or humiliation without pity. 

savagery

noun
  • Savage or brutal behaviour; barbarity. 

  • Wild growth of plants. 

  • A violent act of cruelty. 

  • Savages collectively; the world of savages. 

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