The word sweatshirts 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: 16
Highest Scoring Words With Friends™ Play In The Letters sweatshirts
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Seven Letter Word Alert: (57 words)
artiest, artists, ashiest, asserts, atheist, attires, hastier, hatters, hissers, hitters, iratest, rashest, rattish, resists, rethaws, retwist, sassier, satires, shatter, siestas, sisters, sitters, stashes, staters, straits, striate, swasher, swashes, swathes, swatter, swisher, swishes, tartish, tasters, tastier, theists, thirsts, threats, thwarts, tithers, trashes, tsarist, twister, waiters, wariest, washers, wasters, wearish, whitest, wiseass, wishers, withers, witters, wraiths, wrasses, wreaths, writhes