raison d'être vs responsibility

raison d'être

noun
  • Reason for being. The claimed reason for the existence of something or someone; the sole or ultimate purpose of something or someone. 

responsibility

noun
  • The state of being liable, culpable, or responsible for something in particular. 

  • A duty, obligation or liability for which someone is held accountable. 

  • The state of being responsible, accountable, or answerable. 

  • The obligation to carry forward an assigned task to a successful conclusion. With responsibility goes authority to direct and take the necessary action to ensure success. 

  • The obligation for the proper custody, care, and safekeeping of property or funds entrusted to the possession or supervision of an individual. 

How often have the words raison d'être and responsibility occurred in a corpus of books? (source: Google Ngram Viewer )