/ Thesaurus / B Synonyms of business letter Find synonyms for: Noun1. business letter, letter, missiveusage: a letter dealing with businessWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: didactic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language