postmortem examination vs necropsy

postmortem examination and necropsy both are nouns.

Word	Noun	Adjective	Verb	Adverb
postmortem examination	Yes	No	No	No
necropsy	Yes	No	No	No

As nouns, postmortem examination and necropsy are synonyms defined as:

postmortem examination and necropsy: an examination and dissection of a dead body to determine cause of death or the changes produced by disease

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

postmortem examination (noun)	necropsy (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