The word overwhelmingly 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: 33
Highest Scoring Words With Friends™ Plays In The Letters overwhelmingly
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Seven Letter Word Alert: (50 words)
ergonym, eviller, greenly, gremlin, heeling, hegemon, hemline, heroine, hoveler, however, howling, hygiene, leering, leghorn, levying, loverly, lowlier, meowing, mingler, mongery, mongrel, myeline, nowhere, overlie, ovinely, reeling, reeving, regimen, rehinge, relying, reweigh, rewoven, rhyming, rolling, veering, veliger, vermeil, weevily, weigher, welling, wherein, whereon, whinger, whoever, wiremen, worming, wrongly, yelling, yelming, yowling