dying vs expiration

dying

noun
  • The process of approaching death; loss of life; death. 

adj
  • Declining, terminal, or drawing to an end. 

  • Pertaining to death, or the moments before death. 

  • Approaching death; about to die; moribund. 

expiration

noun
  • The last emission of breath; death. 

  • That which is produced by breathing out, as a sound. 

  • A cessation, extinction, ending 

  • Emission of volatile matter; exhalation. 

  • The act of expiring. 

  • The act or process of breathing out, or forcing air from the lungs through the nose or mouth 

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