strident vs vociferous

strident and vociferous both are adjectives.

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

As adjectives, strident and vociferous are synonyms defined as:

strident and vociferous: conspicuously and offensively loud; given to vehement outcry

Other synonyms of strident include blatant, clamant, clamorous.

strident (adjective)	vociferous (adjective)
unpleasantly loud and harsh	conspicuously and offensively loud; given to vehement outcry
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')