The word exclusiveness 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: 30
Highest Scoring Words With Friends™ Play In The Letters exclusiveness
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Seven Letter Word Alert: (28 words)
celsius, elevens, elusive, essence, evinces, evulses, excises, excuses, iceless, lessees, lessens, leucine, license, sessile, sexless, silence, sinless, sinuses, sleeves, sluices, snivels, sunless, unveils, useless, veinule, venules, vesicle, vessels