The word magnanimousness 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 magnanimousness
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Seven Letter Word Alert: (72 words)
agnosia, agonies, agonise, agonism, amasses, ammines, ammonia, amnesia, amnions, amusing, anginas, angioma, animose, assigns, assuage, assumes, egoisms, enigmas, ensigns, ensuing, gaseous, goannas, guanine, guineas, gummose, gussies, igneous, iguanas, imagoes, inseams, magnons, magnums, manages, mangoes, manning, mansion, massage, massing, meaning, messing, miasmas, mimosas, minuses, misname, misuses, mnemons, moaning, mossing, mousing, mousses, musings, nannies, nonanes, nongame, nonsane, noseans, osmiums, osseins, sangoma, sassing, sausage, seaming, seasons, sensing, session, siennas, sinuses, smegmas, summing, summons, sunnies, sunning