/ Thesaurus / F Synonyms of form letter Find synonyms for: Noun1. form letter, letter, missiveusage: a letter that is printed in multiple copies and mailed to a list of recipientsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language