The word frangibility 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 frangibility
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Seven Letter Word Alert: (35 words)
ability, agility, airlift, anglify, angrily, bailing, bairnly, baiting, barfing, biliary, blaring, braying, failing, faintly, fairing, flaring, flaying, frailty, fraying, gratify, ingraft, initial, intagli, lairing, lifting, lignify, niftily, nitrify, rafting, railing, rifling, rifting, tabling, tailfin, tailing