blindness vs cognizance

blindness

noun
  • Want of intellectual or moral discernment; mental darkness; ignorance, heedlessness. 

  • The condition of being blind; unable to see. 

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. 

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