defiance vs oppugnation

defiance

noun
  • Open or bold resistance to or disregard for authority, opposition, or power. 

  • A challenging attitude or behaviour; challenge. 

  • The feeling, or spirit of being defiant. 

oppugnation

noun
  • opposition 

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