death sentence vs mortality

death sentence

noun
  • Anything that spells death. 

  • A decree that someone be put to death as a punishment for a crime; a sentence of execution. 

mortality

noun
  • Death. 

  • The number of deaths per given unit of population over a given period of time. 

  • Deaths resulting from an event (such as a war, epidemic or disaster). 

  • The state of being susceptible to death. 

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