post-mortem examination vs autopsy

post-mortem examination and autopsy both are nouns.

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

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

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

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

post-mortem examination (noun)	autopsy (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

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