post-mortem vs give-and-take

post-mortem and give-and-take both are nouns.

Word	Noun	Adjective	Verb	Adverb
post-mortem	Yes	No	No	No
give-and-take	Yes	No	No	No

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

Other hypernyms of post-mortem include discussion, word.

post-mortem (noun)	give-and-take (noun)
an examination and dissection of a dead body to determine cause of death or the changes produced by disease	mutual interaction; the activity of reciprocating or exchanging (especially information)
discussion of an event after it has occurred	an exchange of views on some topic
	light teasing repartee