The word corticosteroid 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: 21
Highest Scoring Words With Friends™ Play In The Letters corticosteroid
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Seven Letter Word Alert: (71 words)
ceroids, codices, coedits, cooties, correct, corrode, cotters, credits, cricoid, critics, critter, crosier, decocts, deictic, deistic, detorts, diciest, dietics, dietist, dioecic, diorite, directs, dirtier, dirties, disroot, distort, ditsier, ditties, dittoes, doctors, dotiest, dotters, dottier, editors, erotics, icteric, iodiser, iodites, osteoid, records, rectors, redroot, reroots, retorts, rioters, risotto, roisted, roister, roosted, rooster, rooters, rotters, scooted, scooter, sootier, soricid, sortied, steroid, stirred, storied, strider, stridor, tictocs, tidiers, tidiest, tierods, tooters, tootsie, toroids, tricots, trisect