cognizance vs secrecy

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. 

secrecy

noun
  • Concealment; the condition of being secret or hidden. 

  • The habit of keeping secrets. 

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