cognizance vs heedfulness

cognizance

noun
  • Notice or awareness. 

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

  • Jurisdiction. 

heedfulness

noun
  • The state or quality of being heedful. 

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