brutality vs despotism

brutality

noun
  • A cruel or savage act. 

  • The state of being brutal. 

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

despotism

noun
  • government by a singular authority, either a single person or tight-knit group, which rules with absolute power, especially in a cruel and oppressive way. 

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