brutality vs ferociousness

brutality

noun
  • The state of being brutal. 

  • A cruel or savage act. 

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

ferociousness

noun
  • The quality of being ferocious; ferocity 

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