shrillness vs interestingness

shrillness and interestingness both are nouns.

Word	Noun	Adjective	Verb	Adverb
shrillness	Yes	No	No	No
interestingness	Yes	No	No	No

As nouns, interestingness is a hypernym of shrillness; that is, interestingness is a word with a broader meaning than shrillness:

shrillness: the quality of being sharp or harsh to the senses
interestingness: the power of attracting or holding one's attention (because it is unusual or exciting etc.)

Other hypernyms of shrillness include interest.

shrillness (noun)	interestingness (noun)
having the timbre of a loud high-pitched sound	the power of attracting or holding one's attention (because it is unusual or exciting etc.)
the quality of being sharp or harsh to the senses