Synonyms for Postmortem (same or very similar meaning)
WordNet sense 1 (discussion of an event after it has occurred):
post-mortem
WordNet sense 2 (coming after or following):
succeeding
WordNet sense 3 (occurring or done after death):
postmortal
WordNet sense 4 (an examination and dissection of a dead body to determine cause of death or the changes produced by disease):
autopsy, necropsy, pm, postmortem examination, post-mortem examination
From the ODE community, based on WordNet
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