death march vs inhumation

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. 

inhumation

noun
  • The act of burial. 

  • arenation 

  • The act of burying vessels in warm earth in order to expose their contents to a steady moderate heat; the state of being thus exposed. 

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