The word overachievement 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: 32
Highest Scoring Words With Friends™ Play In The Letters overachievement
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Seven Letter Word Alert: (94 words)
acetone, achieve, aconite, activer, another, archive, arenite, avivore, carmine, carvone, cavemen, certain, chainer, chanter, chariot, cheater, cheerio, chevron, chimera, chimere, chroman, cithern, convert, coterie, coveter, cremate, earthen, emirate, emotive, enactor, enteric, enticer, erotica, etaerio, etheric, evictee, evictor, evocate, hairnet, haricot, hearten, heavier, hectare, heretic, heroine, incomer, inreach, machete, machine, marconi, matcher, matinee, meatier, menorah, methane, minaret, miocene, monarch, moraine, neither, nematic, notcher, octamer, onetime, otarine, overact, overate, overeat, overman, raiment, receive, rechain, recheat, rechime, reenact, rematch, reteach, revoice, romaine, romance, teacher, teenier, theorem, therein, thereon, thermic, tonearm, trainee, tranche, triaene, trochee, varmint, veteran, vomiter