The word luminosities 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 luminosities
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Seven Letter Word Alert: (57 words)
elision, elitism, elusion, elution, emulsin, enlists, ensouls, ileitis, inosite, insoles, insults, iolites, ionises, lesions, lioness, lionets, lionise, lionism, listens, lotuses, luniest, meiosis, minuets, minuses, minutes, missile, mission, missuit, mistune, mitoses, mitosis, moisten, molests, moulins, mountie, mueslis, munites, muslins, nosiest, oiliest, outlies, outline, silents, similes, solutes, somites, stimies, stimuli, stomies, tinsels, tonsils, tousles, unities, unlists, unsmelt, utensil, utilise