mortality vs shinigami

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. 

shinigami

noun
  • A deity and/or personification of death. 

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