/ Thesaurus / S Synonyms of side door Find synonyms for: Noun1. side door, side entrance, exterior door, outside doorusage: an exterior door at one side of a buildingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language