The word shelterbelts 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™ Play In The Letters shelterbelts
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Seven Letter Word Alert: (34 words)
beetles, betters, blesser, blether, herblet, letters, rebells, rebless, reheels, resells, retells, retests, seether, seethes, sellers, settees, setters, settler, settles, sheeter, sheller, shelter, sherbet, streets, teeters, teether, teethes, tellers, tersest, testers, tethers, trebles, treelet, trestle