breathlessness vs death rattle

breathlessness

noun
  • The state of being breathless or out of breath. 

  • Difficult or labored respiration, dyspnea, shortness of breath 

death rattle

noun
  • The raspy or gurgling sound sometimes made by a person while drawing in or expelling their final breaths before dying. 

  • The sound of a batsman’s stumps being broken, so called because this leads to the batsman’s dismissal. 

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