imperative vs strident

imperative is a noun but strident is not a noun.

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

imperative (noun)	strident (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

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