The word overweights 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: 22
Highest Scoring Words With Friends™ Play In The Letters overweights
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Seven Letter Word Alert: (39 words)
eighter, erosive, erotise, goiters, goitres, goriest, grieves, grovets, growths, heroise, heteros, hogties, however, ogreish, overset, oversew, oversit, overwet, regives, resight, restive, reviews, revotes, reweigh, showier, sievert, sighter, thieves, thrives, vertigo, vestige, vetoers, viewers, weigher, weights, whereto, whoever, withers, writhes