conviction vs obstinancy

conviction

noun
  • A judgement of guilt in a court of law. 

  • The state of being wholly convinced. 

  • A firmly held belief. 

  • The state of being found or proved guilty. 

obstinancy

noun
  • Obstinance; the characteristic of being obstinate. 

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