/ Thesaurus / L Synonyms of love letter Find synonyms for: Noun1. love letter, billet doux, personal letterusage: a personal letter to a loved one expressing affectionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language