stridence vs shrillness

stridence and shrillness both are nouns.

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

As nouns, stridence and shrillness are synonyms defined as:

stridence and shrillness: having the timbre of a loud high-pitched sound

Other synonyms of stridence include stridency.

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