/ Thesaurus / F Synonyms of frederick william iii Find synonyms for: Noun1. Frederick William IIIusage: king of Prussia who became involved in the Napoleonic Wars (1770-1840)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language