/ Thesaurus / H Synonyms of horseradish root Find synonyms for: Noun1. horseradish, horseradish root, rootusage: the root of the horseradish plant; it is grated or ground and used for seasoningWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language