medical checkup vs scrutiny

medical checkup and scrutiny both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical checkup	Yes	No	No	No
scrutiny	Yes	No	No	No

As nouns, scrutiny is a hypernym of medical checkup; that is, scrutiny is a word with a broader meaning than medical checkup:

medical checkup: a thorough physical examination; includes a variety of tests depending on the age and sex and health of the person
scrutiny: the act of examining something closely (as for mistakes)

Other hypernyms of medical checkup include examination.

medical checkup (noun)	scrutiny (noun)
a thorough physical examination; includes a variety of tests depending on the age and sex and health of the person	the act of examining something closely (as for mistakes)
	a prolonged intense look