The word trusteeships 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 trusteeships
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Seven Letter Word Alert: (63 words)
epithet, heiress, hessite, hirsute, hissers, hitters, hussies, issuers, persist, peruses, pesters, petites, pettier, pettish, presets, presses, pretest, priests, purists, pushers, pushier, pussier, pussies, putters, puttier, putties, reissue, reships, resists, respite, resteps, retests, russets, septets, sestets, setters, shutter, sisters, sitters, spheres, spriest, sprites, sputter, streets, stripes, stupers, suiters, suspire, tersest, testers, testier, tethers, theists, thirsts, thrusts, tipster, tissues, tithers, tresses, trusses, trustee, tsetses, uprises