dependence vs incredulity

dependence

noun
  • The state of being dependent, of relying upon another. 

  • An irresistible physical or psychological need, especially for a chemical substance. 

incredulity

noun
  • Religious disbelief, lack of faith. 

  • Unwillingness or inability to believe; doubt about the truth or verisimilitude of something; disbelief. 

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