strident vs stridence

strident is not a noun while stridence is a noun.

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

strident (noun)	stridence (noun)
	having the timbre of a loud high-pitched sound

strident (adjective)	stridence (adjective)
unpleasantly loud and harsh
being sharply insistent on being heard
conspicuously and offensively loud; given to vehement outcry
of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')