/ Thesaurus / J Synonyms of john of gaunt Find synonyms for: Noun1. John of Gaunt, Duke of Lancasterusage: the fourth son of Edward III who was the effective ruler of England during the close of his father's reign and during the minority of Richard II; his son was Henry Bolingbroke (1340-1399)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language