/ Thesaurus / W Synonyms of william iii Find synonyms for: Noun1. William III, William of Orangeusage: King of England and Scotland and Ireland; he married the daughter of James II and was invited by opponents of James II to invade England; when James fled, William III and Mary II were declared joint monarchs (1650-1702)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language