The word sweatshirt 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: 15
Highest Scoring Words With Friends™ Play In The Letters sweatshirt
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Seven Letter Word Alert: (46 words)
artiest, artists, ashiest, atheist, attires, hastier, hatters, hitters, iratest, rashest, rattish, rethaws, retwist, satires, shatter, sitters, staters, straits, striate, swasher, swathes, swatter, swisher, tartish, tasters, tastier, theists, thirsts, threats, thwarts, tithers, trashes, tsarist, twister, waiters, wariest, washers, wasters, wearish, whitest, wishers, withers, witters, wraiths, wreaths, writhes