brutality vs severity

brutality

noun
  • The state of being brutal. 

  • A cruel or savage act. 

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

severity

noun
  • The state of being severe. 

  • The degree of something undesirable; badness or seriousness. 

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