oppression vs tyranthood

oppression

noun
  • The exercise of authority or power in a burdensome, cruel, or unjust manner. 

  • The act of oppressing, or the state of being oppressed. 

  • A feeling of being oppressed. 

tyranthood

noun
  • The state or condition of being a tyrant. 

  • A governmental system based on a single ruler wielding absolute authority; tyranny. 

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