/ Thesaurus / R Synonyms of robert mills Find synonyms for: Noun1. Mills, Robert Millsusage: United States architect who was the presidentially appointed architect of Washington D.C. (1781-1855)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language