/ Thesaurus / E Synonyms of express mail Find synonyms for: Noun1. express, express mail, mailusage: mail that is distributed by a rapid and efficient systemVerb1. express-mail, mail, post, sendusage: send by express mail or courier; "Express-mail the documents immediately"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language