The word perfectibility 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™ Plays In The Letters perfectibility
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Seven Letter Word Alert: (37 words)
beetfly, betitle, bittier, briefly, brittle, certify, clitter, cretify, epicyte, erectly, eyelift, febrile, fertile, fierily, filbert, firelit, firepit, liberty, pelitic, perfect, perlite, petrify, pettier, pettily, picrite, plebify, prefect, prefile, prelect, pyritic, receipt, rectify, reflect, reptile, retitle, triplet, yperite