The word stilbestrols 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: 17
Highest Scoring Words With Friends™ Play In The Letters stilbestrols
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Seven Letter Word Alert: (60 words)
besorts, betoils, billets, biotest, bistros, bitsets, bitters, blisses, blister, blotter, boilers, bolster, bolters, bossier, bottler, bottles, bristle, bristol, brittle, estriol, lessors, litters, littler, lobster, loiters, lossier, ostlers, rebills, reboils, relists, resists, resoils, retills, retilts, ribless, riblets, riboses, rillets, rosiest, setbolt, sisters, sitters, slitter, sorbets, sorbite, sorties, sterols, stiller, stilter, stories, strobes, strolls, tillers, tilters, toilers, toilets, tollers, tossers, trellis, trilobe