/ Thesaurus / T Synonyms of testifier Find synonyms for: Noun1. testifier, deponent, deposer, witness, witnesser, informantusage: a person who testifies or gives a depositionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: inane Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language