shrill vs shrillness

shrill is not a noun while shrillness is a noun.

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

shrill (noun)	shrillness (noun)
	having the timbre of a loud high-pitched sound
	the quality of being sharp or harsh to the senses

shrill (adjective)	shrillness (adjective)
of colors that are bright and gaudy
having or emitting a high-pitched and sharp tone or tones
being sharply insistent on being heard

shrill (verb)	shrillness (verb)
utter a shrill cry