autopsy vs post-mortem

autopsy and post-mortem both are nouns.

Word	Noun	Adjective	Verb	Adverb
autopsy	Yes	No	Yes	No
post-mortem	Yes	No	No	No

As nouns, autopsy and post-mortem are synonyms defined as:

autopsy and post-mortem: an examination and dissection of a dead body to determine cause of death or the changes produced by disease

Other synonyms of autopsy include necropsy, PM, post-mortem examination, postmortem, postmortem examination.

autopsy (noun)	post-mortem (noun)
an examination and dissection of a dead body to determine cause of death or the changes produced by disease	an examination and dissection of a dead body to determine cause of death or the changes produced by disease
	discussion of an event after it has occurred

autopsy (verb)	post-mortem (verb)
perform an autopsy on a dead body; do a post-mortem