The word overexploited 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 overexploited
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Seven Letter Word Alert: (68 words)
deerlet, deleter, deliver, deplete, deplore, deprive, develop, devotee, diopter, dioptre, dovelet, droplet, epidote, epoxide, epoxied, everted, exerted, expired, explode, exploit, explore, extoled, extoler, levered, loopier, optrode, overdot, overled, overlie, overlit, overtip, overtop, peridot, periled, perlite, petered, petiole, piloted, pivoted, pivoter, politer, preedit, provide, proxied, redpole, reexpel, relieve, relived, reoiled, repiled, repilot, repivot, replete, replied, reptile, retiled, reveled, reviled, revoted, riveted, telexed, telopod, tepider, torpedo, tripled, tripole, trooped, volepox