/ Thesaurus / G Synonyms of giant hyssop Find synonyms for: Noun1. giant hyssop, herb, herbaceous plantusage: any of a number of aromatic plants of the genus AgastacheWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fortuitous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language