The word cloudinesses 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: 19
Highest Scoring Words With Friends™ Play In The Letters cloudinesses
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Seven Letter Word Alert: (57 words)
celsius, cession, codeine, consuls, cosines, coulees, counsel, cousins, deciles, decline, delouse, denoise, diesels, diocese, discuss, eloined, elusion, enclose, encodes, endless, ensouls, escudos, iceless, include, indoles, induces, insoles, lesions, lessens, lessons, leucine, license, linseed, lioness, nodules, nuclide, oilseed, oldness, osseins, ossicle, seclude, seconds, seduces, sessile, session, silence, sinless, sinuses, sluiced, sluices, sodless, sonless, sunless, unclose, uncoils, unoiled, useless