The word restaurateurs 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (50 words)
aerates, arrears, arrests, astuter, aurates, austere, auteurs, erasers, erasure, estates, estuate, euaster, rasters, ratters, reseats, restart, restate, resters, retaste, retears, retests, retreat, reutter, searats, seastar, seaters, serrate, setters, starers, starter, staters, statues, stature, stratas, stratus, streets, sutures, tartars, tasters, tearers, teasers, tersest, testers, treater, trustee, truster, turrets, ureases, ureters, utterer