The word shirtsleeves 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: 19
Highest Scoring Words With Friends™ Plays In The Letters shirtsleeves
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Seven Letter Word Alert: (44 words)
eeriest, evilest, heiress, hessite, hissers, lessees, reheels, relieve, relists, relives, resists, restive, retiles, reviles, revises, seether, seethes, servile, servlet, sessile, sheeter, shelter, shelver, shelves, shivers, shrivel, sievert, silvers, sisters, sleeves, slither, slivers, steelie, sterile, stivers, strives, svelter, thieves, thrives, tieless, tresses, veilers, verists, vessels