brutality vs cruelty

brutality

noun
  • A cruel or savage act. 

  • The state of being brutal. 

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

cruelty

noun
  • A cruel act. 

  • An indifference to suffering or pleasure in inflicting suffering. 

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