The word curvaceousness 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: 27
Highest Scoring Words With Friends™ Play In The Letters curvaceousness
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Seven Letter Word Alert: (70 words)
accrues, accurse, accuser, accuses, acerose, acerous, ancress, arouses, assures, avenues, cancers, canoers, careens, carouse, carvone, cassons, causers, caverns, censers, censors, censure, coarsen, coerces, concave, concurs, concuss, corneas, courses, creases, cresses, crosses, cussers, encases, encores, ensears, ensures, necrose, nervous, nouveau, oversea, overuse, raucous, reasons, recanes, recuses, resaves, rescans, rescues, saucers, savours, scarves, sconces, screens, seances, seasons, secerns, secures, sensors, soccers, sources, success, succors, succour, sucrase, sucrose, uncover, uncross, uncurse, ureases, vacuous