The word trusteeship 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™ Plays In The Letters trusteeship
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Seven Letter Word Alert: (50 words)
epithet, heiress, hessite, hirsute, hitters, persist, peruses, pesters, petites, pettier, pettish, presets, pretest, priests, purists, pushers, pushier, pussier, putters, puttier, putties, reissue, reships, respite, resteps, retests, septets, setters, shutter, sitters, spheres, spriest, sprites, sputter, streets, stripes, stupers, suiters, suspire, tersest, testers, testier, tethers, theists, thirsts, thrusts, tipster, tithers, trustee, uprises