The word fibrillated 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: 20
Highest Scoring Words With Friends™ Plays In The Letters fibrillated
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Seven Letter Word Alert: (28 words)
airlift, bedrail, brailed, braille, deliria, dialler, dilater, driblet, fibrate, filbert, filiate, firelit, flailed, flatbed, flirted, friable, frilled, illbred, libated, liberal, literal, rallied, tallied, tallier, trailed, triable, trifled, trilled