The word breathlessly is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Plays In The Letters breathlessly
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Seven Letter Word Alert: (96 words)
alertly, artless, ballets, barleys, bashers, basters, bathers, beastly, beaters, belayer, berates, betrays, blaster, blather, bleater, blesser, blether, braless, brashly, breasts, breathe, breaths, breathy, earless, earthly, elaters, essayer, eyeball, eyebars, eyebath, eyelash, halters, hatless, healers, hearses, heaters, herbals, herblet, labeler, lashers, lathers, lathery, leasers, leashes, leather, lysates, rashest, rayless, realest, rebales, rebases, rebates, rebathe, rebaths, rebells, reblast, rebless, reheats, relabel, relates, resales, reseals, reseats, resells, restyle, retally, retells, sealers, seaters, seeably, sellers, sheerly, sheller, shelter, sherbet, shyster, slasher, slaters, slather, slayers, stabler, stables, stayers, stealer, stellar, stylers, tealess, teasels, teasers, tellers, tersely, thereby, thralls, trashes, trebles, yellers