succeeding vs postmortem

succeeding is not a noun while postmortem is a noun.

Word	Noun	Adjective	Verb	Adverb
succeeding	No	Yes	No	No
postmortem	Yes	Yes	No	No

succeeding (noun)	postmortem (noun)
	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

succeeding (adjective)	postmortem (adjective)
coming after or following	occurring or done after death
(of elected officers) elected but not yet serving	after death or after an event