The word tenterhooks 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (28 words)
estrone, heteros, honoree, hookers, hornets, ketones, knotter, netters, onshore, rehones, rehooks, reknots, reshook, reshoot, restoke, rosette, shooter, shorten, snooker, snotter, soother, tenters, tethers, thereon, thereto, thrones, tooters, tornote