death march vs obit

death march

noun
  • Synonym of dead march (“mournful music for a funeral etc.”) 

  • A forced movement of people, on foot, in such circumstances that many die during the journey. 

  • A project that requires a stretch of unsustainable overwork, or whose participants feel it is destined to fail. 

obit

noun
  • A mass or other service held for the soul of a dead person. 

  • An obituary. 

  • A record of a person's death. 

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