brutality vs ferity

brutality

noun
  • The state of being brutal. 

  • A cruel or savage act. 

  • The use of excessive physical force, often in the form of violence. 

ferity

noun
  • The quality or fact of being wild or in a wild state; wildness, brutishness. 

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