The word shuttering 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™ Plays In The Letters shuttering
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Seven Letter Word Alert: (36 words)
entrust, gunters, gushier, gustier, gutsier, gutters, hirsute, hitters, hungers, hunters, hurting, husting, hutting, intrust, nutsier, nutters, nuttier, resight, resting, retints, reusing, rushing, rusting, rutting, setting, shunter, shutter, sighter, stinger, stunter, testing, tighten, tighter, tinters, tithers, uniters