mortality vs oblivion

mortality

noun
  • The state of being susceptible to death. 

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

  • Death. 

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

oblivion

noun
  • A form of purgatory. 

  • The state of being completely forgotten, of being reduced to a state of non-existence, extinction, or nothingness, including through war and destruction. (Figuratively) for an area like hell, a wasteland. 

  • The state of forgetting completely, of being oblivious, unconscious, unaware, as when sleeping, drunk, or dead. 

verb
  • To consign to oblivion; to efface utterly. 

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