refusal vs responsibility

refusal

noun
  • The act of refusing. 

  • Depth or point at which well or borehole drilling cannot continue. 

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 refusal and responsibility occurred in a corpus of books? (source: Google Ngram Viewer )