The word nucleosides 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: 18
Highest Scoring Words With Friends™ Play In The Letters nucleosides
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Seven Letter Word Alert: (45 words)
celsius, cession, codeine, consuls, cosines, coulees, counsel, cousins, deciles, decline, delouse, denoise, diesels, diocese, eloined, elusion, enclose, encodes, endless, ensouls, escudos, iceless, include, indoles, induces, insoles, lesions, leucine, license, linseed, lioness, nodules, nuclide, oilseed, oldness, ossicle, seclude, seconds, seduces, silence, sluiced, sluices, unclose, uncoils, unoiled