/ Thesaurus / P Synonyms of potassium nitrate Find synonyms for: Noun1. potassium nitrate, saltpeter, saltpetre, niter, nitre, nitrateusage: (KNO3) used especially as a fertilizer and explosiveWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language