The word overreckoning 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: 28
Highest Scoring Words With Friends™ Play In The Letters overreckoning
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Seven Letter Word Alert: (43 words)
conking, connive, convene, convoke, cooking, coreign, corking, cornier, corning, coroner, coverer, cringer, crooner, environ, evening, evoking, generic, griever, grinner, groover, invoker, ionogen, keening, kerning, kerogen, kneeing, necking, nervier, nerving, nocking, nongeek, oncogen, recking, recover, reeking, reeving, reigner, revoice, revoker, rockier, rocking, rooking, veering