The word unshuttered 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: 17
Highest Scoring Words With Friends™ Play In The Letters unshuttered
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Seven Letter Word Alert: (37 words)
denture, detents, detuner, detunes, endures, ensured, enthuse, entrust, hunters, netters, neuters, nutseed, nutters, retuned, retunes, shunted, shunter, shutter, stented, sterned, student, stunted, stunter, sutured, tenders, tenters, tenured, tenures, tethers, thunder, trusted, trustee, undrest, unreset, untruth, ushered, uttered