The word restrainers 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: (73 words)
aeriest, antsier, arenite, arrests, artsier, earners, earnest, easiest, eastern, ensears, entries, erasers, errants, inerter, inserts, instars, nastier, nearest, nesters, raisers, ranters, rasters, rearise, reinter, renests, renters, rerents, rerinse, reseats, resents, restain, resters, restirs, retains, retears, retinas, retirer, retires, retrain, retries, rinsers, sateens, satires, seaters, seitans, seitens, senates, sensate, seriate, serrate, sestina, sestine, sierras, sinters, snarers, stainer, starers, sterane, sterner, stirrer, strains, tarrier, tarries, tearers, tearier, teasers, terrain, terrane, terrier, trainee, trainer, triaene, trienes