/ Thesaurus / G Synonyms of grand duke Find synonyms for: Noun1. grand duke, princeusage: a prince who rules a territoryWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language