The word nucleoside 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: 17
Highest Scoring Words With Friends™ Play In The Letters nucleoside
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Seven Letter Word Alert: (27 words)
codeine, coulees, counsel, deciles, decline, delouse, denoise, diocese, eloined, elusion, enclose, encodes, include, indoles, induces, leucine, license, linseed, nodules, nuclide, oilseed, seclude, silence, sluiced, unclose, uncoils, unoiled