The word restaurant 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: 12
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (26 words)
astuter, attunes, aurates, entrust, errants, narrate, natters, natures, nutters, ranters, ratters, restart, returns, saunter, starter, stature, stunter, tartans, tartars, taunter, tautens, tetanus, truants, truster, turners, turrets