N correspondence, letter, epistle, note, billet, post card, missive, circular, favor, billet-doux, chit, chitty, letter card, picture post card, postal, card, despatch, dispatch, bulletin, these presents, rescript, rescription, post, epistolary, furor scribendi.

Endearment

N endearment, caress, blandishment, blandiment, panchement, fondling, billing and cooing, dalliance, necking, petting, sporting, sparking, hanky-panky, caressing, embrace, salute, kiss, buss, smack, osculation, deosculation, amorous glances, courtship, wooing, suit, addresses, the soft impeachment, lovemaking, serenading, caterwauling, flirting, flirtation, gallantry, coquetry, true lover's knot, plighted love, love tale, love token, love letter, billet-doux, valentine, honeymoon, Strephon and Chloe, caressing, sighing like furnace, love-sick, spoony, caressed, faint heart neer won fair lady, kisses honeyed by oblivion.

For further exploring for "billet-doux" in Webster Dictionary Online

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