/ Thesaurus / C Synonyms of caustic potash Find synonyms for: Noun1. potash, caustic potash, potassium hydroxide, hydroxide, hydrated oxide, lyeusage: a potassium compound often used in agriculture and industryWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language