The word practicability 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™ Play In The Letters practicability
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Seven Letter Word Alert: (26 words)
ability, acrylic, airplay, albitic, aplitic, biliary, bitpart, caltrap, capably, capital, cattail, cattily, ciliary, clarity, clipart, cryptic, partial, patrial, playact, practic, pyritic, rattail, tacitly, tilapia, tipcart, typical