The word turtlenecks 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: 21
Highest Scoring Words With Friends™ Play In The Letters turtlenecks
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Seven Letter Word Alert: (46 words)
censure, centers, centres, clunker, cluster, clutter, curette, cutlets, cutters, eluents, encrust, entrust, kernels, kestrel, kettles, lectern, lecture, letters, lettuce, netters, nettles, neuters, nutlets, nutters, recluse, relents, restuck, retunes, scenter, sculker, scuttle, settler, skelter, stunter, suckler, telnets, tenters, tenures, trestle, truckle, trustee, tuckers, turtles, unerect, unreels, unreset