The word thunderstorm 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: 20
Highest Scoring Words With Friends™ Plays In The Letters thunderstorm
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Seven Letter Word Alert: (94 words)
dehorns, dehorts, demount, detorts, detours, dormers, dotters, druther, dustmen, endmost, entrust, homerun, hornets, humored, hunters, hurters, mentors, meronts, methods, moderns, monster, mordent, mothers, mounted, mounter, mourned, mourner, mouthed, murders, mutters, norther, nostrum, nutters, remound, remount, resound, retorts, retours, returns, rhetors, rodents, rostrum, rotters, rotunds, rounder, routers, rumored, shorted, shorten, shorter, shotted, shouted, shouter, shunted, shunter, shutter, smother, smutted, snorted, snorter, snotted, snotter, snouted, sounder, sternum, stormed, stouter, student, stunted, stunter, teutons, thermos, thorned, throned, thrones, thunder, tonsure, torment, torrent, torture, tourers, touters, tremors, trouser, trusted, truster, turners, turrets, tutored, tutorer, undoers, undrest, unhorse, unshoed