The word wineglasses 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: (30 words)
ageless, assigns, aweless, enseals, gasless, genesis, genials, glasses, lassies, leasing, lessens, ligases, lineage, salines, sassing, sealing, seesaws, sessile, sewings, signals, signees, silanes, singles, sinless, slewing, wangles, weasels, wigless, winless, wiseass