strident vs imperative

strident is not a noun while imperative is a noun.

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

strident (noun)	imperative (noun)
	some duty that is essential and urgent
	a verb in the imperative mood.
	a mood that expresses an intention to influence the listener's behavior

strident (adjective)	imperative (adjective)
unpleasantly loud and harsh	requiring attention or action
being sharply insistent on being heard	relating to verbs in the imperative mood
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')