post-mortem vs word

post-mortem and word both are nouns.

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

As nouns, word is a hypernym of post-mortem; that is, word is a word with a broader meaning than post-mortem:

Other hypernyms of post-mortem include discussion, give-and-take.

post-mortem (noun)	word (noun)
an examination and dissection of a dead body to determine cause of death or the changes produced by disease	a unit of language that native speakers can identify
discussion of an event after it has occurred	a promise
	information about recent and important events
	a brief statement
	an exchange of views on some topic
	a secret word or phrase known only to a restricted group
	a verbal command for action
	a string of bits stored in computer memory

post-mortem (verb)	word (verb)
	put into words or an expression