The word melodiousness 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: 20
Highest Scoring Words With Friends™ Plays In The Letters melodiousness
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Seven Letter Word Alert: (65 words)
delimes, delouse, demises, denoise, deslime, diesels, dimness, dimuons, dominos, eloined, elusion, emulsin, endless, ensouls, eudemon, indoles, insoles, lemoned, lesions, lessens, lessons, linseed, lioness, loonies, loosens, meioses, minuses, misdoes, misdone, misused, misuses, modules, monoids, moulins, moussed, mousses, mueslis, muslins, mussels, nemesis, nodules, noisome, noodles, nosodes, oilseed, oldness, oleosin, ominous, osmosis, osseins, osseous, sessile, session, siemens, sinless, sinuses, sodiums, sodless, someone, somonis, sonless, sunless, unloose, unoiled, useless