necropsy vs post-mortem

necropsy and post-mortem both are nouns.

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

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

necropsy 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 necropsy include autopsy, PM, post-mortem examination, postmortem, postmortem examination.

necropsy (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