time study vs scrutiny

time study and scrutiny both are nouns.

Word	Noun	Adjective	Verb	Adverb
time study	Yes	No	No	No
scrutiny	Yes	No	No	No

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

time study: an analysis of a specific job in an effort to find the most efficient method in terms of time and effort
scrutiny: the act of examining something closely (as for mistakes)

Other hypernyms of time study include examination.

time study (noun)	scrutiny (noun)
an analysis of a specific job in an effort to find the most efficient method in terms of time and effort	the act of examining something closely (as for mistakes)
	a prolonged intense look