post-mortem examination vs postmortem examination

post-mortem examination and postmortem examination both are nouns.

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

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

post-mortem examination and postmortem examination: 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 autopsy, necropsy, PM, post-mortem, postmortem.

post-mortem examination (noun)	postmortem examination (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