cognizance vs ignorance

cognizance

noun
  • An emblem, badge or device, used as a distinguishing mark by the body of retainers of a royal or noble house. 

  • Notice or awareness. 

  • Jurisdiction. 

ignorance

noun
  • The condition of being uninformed or uneducated; lack of knowledge or information. 

  • Sins committed through ignorance. 

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