The word greaseproofer 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™ Plays In The Letters
Seven Letter Word Alert: (34 words)
apogees, eagerer, forager, forages, foresee, forgers, forgoer, forgoes, grasper, greaser, gropers, peerage, poofers, prefers, presage, proofer, reapers, rearose, reefers, reforge, regears, regrasp, repages, reparse, reposer, reproof, rerapes, reroofs, roarers, roofers, seagoer, seepage, spearer, spoofer