The word mastectomies 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: 21
Highest Scoring Words With Friends™ Plays In The Letters mastectomies
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Seven Letter Word Alert: (37 words)
ascites, atomics, atomise, atomism, coesite, commits, cosiest, cosmism, costate, easiest, emetics, estates, icemass, itemset, mascots, meioses, memetic, mimosas, miscast, mismate, misseat, mitoses, mosaics, oecists, seamost, siamese, sitcoms, somatic, somites, statice, statics, statism, stomate, stomies, taoists, teatime, tomcats