The word overpopulated 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: 26
Highest Scoring Words With Friends™ Play In The Letters overpopulated
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Seven Letter Word Alert: (98 words)
adepter, adopter, alerted, altered, approve, aureole, autopod, averted, delator, deplore, deprave, devalue, develop, doppler, dovelet, droplet, dropout, eluated, epaulet, epurate, erupted, leopard, leotard, louvred, operate, optrode, outdare, outdoer, outlead, outleap, outlove, outplod, outrave, outread, outrode, overate, overdot, overdue, overeat, overlap, overled, overtop, ovulate, papered, paroled, pearled, peopled, pervade, petaled, pleader, pleated, pleopod, pleurae, plouter, popover, popular, poulard, poulter, predate, predeal, prelate, preload, prelude, preplot, pretape, pupated, purpled, raveled, readopt, readout, redealt, redpole, redtape, related, repaved, replate, replead, repleat, reputed, retaped, revalue, revoted, tadpole, tapered, telopod, toppled, toprope, torpedo, trapped, treadle, trooped, trouped, updater, uprated, valeted, vapored, vaulted, vaulter