testing vs scrutiny

testing and scrutiny both are nouns.

Word	Noun	Adjective	Verb	Adverb
testing	Yes	No	No	No
scrutiny	Yes	No	No	No

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

Other hypernyms of testing include examination.

testing (noun)	scrutiny (noun)
the act of subjecting to experimental test in order to determine how well something works	the act of examining something closely (as for mistakes)
the act of giving students or candidates a test (as by questions) to determine what they know or have learned	a prolonged intense look
an examination of the characteristics of something