post-mortem vs scrutiny

post-mortem and scrutiny both are nouns.

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

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

post-mortem: an examination and dissection of a dead body to determine cause of death or the changes produced by disease
scrutiny: the act of examining something closely (as for mistakes)

Other hypernyms of post-mortem include examination.

post-mortem (noun)	scrutiny (noun)
an examination and dissection of a dead body to determine cause of death or the changes produced by disease	the act of examining something closely (as for mistakes)
discussion of an event after it has occurred	a prolonged intense look