conviction vs ideology

conviction

noun
  • A firmly held belief. 

  • A judgement of guilt in a court of law. 

  • The state of being wholly convinced. 

  • The state of being found or proved guilty. 

ideology

noun
  • Doctrine, philosophy, body of beliefs or principles belonging to an individual or group. 

  • The study of the origin and nature of ideas. 

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