THESAURUS
love letter
Pastoral Epistle, aerogram, air letter, airgraph, billet-doux, bull, chain letter, dead letter, dimissorial, dimissory letter, drop letter, encyclical, fan letter, form letter, letter of credit, letter of introduction, letters credential, letters of marque, letters of request, letters overt, letters patent, letters rogatory, mash note, monitory, newsletter, nixie, open letter, pastoral letter, poison-pen letter, round robin, valentine
ROGET THESAURUS
love letter
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.