The word mastopexies 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: 24
Highest Scoring Words With Friends™ Play In The Letters mastopexies
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Seven Letter Word Alert: (34 words)
atomise, easiest, empties, episome, epitome, epoxies, exempts, expiate, exposes, exposit, impasse, impasto, imposes, meatpie, meioses, misseat, misstep, mitoses, mopiest, opiates, pasties, pastime, poesies, poetess, poetise, poxiest, seamost, sexiest, sexpots, siamese, sixstep, somites, stomies, toxemia