The word serrating 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 serrating
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Seven Letter Word Alert: (51 words)
aigrets, angrier, antsier, argents, artsier, earring, erasing, errants, gainers, gaiters, garners, garnets, garrets, garters, gastrin, girners, grainer, granite, granter, graters, grister, ingrate, nastier, rangers, rangier, ranters, ratings, rearing, regains, regrant, restain, resting, retains, retinas, retrain, ringers, searing, seating, stagier, stainer, staring, stinger, strange, tangier, tarries, tarring, tearing, teasing, terrain, trainer, triages