The word overachieving 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: 29
Highest Scoring Words With Friends™ Play In The Letters overachieving
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Seven Letter Word Alert: (44 words)
achieve, arching, archive, avenger, avionic, avivore, carving, carvone, chagrin, chainer, changer, cheerio, chevron, choragi, choregi, choring, coinage, coreign, craving, echoing, engrave, generic, hearing, heavier, heaving, heroine, inreach, inveigh, invoice, ironage, organic, overage, reaving, rechain, reeving, rehinge, reicing, revoice, revving, vearing, veering, veinier, vinegar, voicing