The word overpoweringly 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: 30
Highest Scoring Words With Friends™ Play In The Letters overpoweringly
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Seven Letter Word Alert: (58 words)
eloping, envelop, goopier, greenly, griever, groover, growler, leering, levying, loonier, loopier, looping, nervier, orogeny, overlie, ovinely, peeling, peering, peeving, pingler, pioneer, plovery, plowing, polygon, pooling, preview, prewire, preying, progeny, proline, prolong, pronely, proving, prowler, pyrrole, reeling, reeving, regrown, reigner, relying, repiner, replier, repower, reprove, revelry, reviler, rewoven, veering, veliger, weepily, weeping, weevily, woolier, wringer, wronger, wrongly, yelping, yowling