debriefing vs post mortem

debriefing

noun
  • The act of debriefing, or the state of being debriefed. 

  • The report of a mission or project, or the information so obtained. 

post mortem

noun
  • Any investigation after the conclusion of an activity, particularly when said activity produces an unwanted outcome. 

  • An investigation of a corpse to determine the cause of death. 

adv
  • Occurring after death. 

adj
  • Having been inflicted or having occurred after death. 

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