The word fibrillates 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: 19
Highest Scoring Words With Friends™ Plays In The Letters fibrillates
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Seven Letter Word Alert: (64 words)
airiest, airlift, albites, alibies, astilbe, baiters, ballets, barites, befalls, belfast, billets, bitsier, blaster, blister, braille, bristle, fairest, fairies, fallers, falters, fibrate, fibrils, fibrise, fibster, filbert, filiate, fillers, fillets, fillies, filters, firelit, friable, illites, irisate, libates, liberal, lifters, literal, rallies, realist, rebaits, rebills, reblast, refills, retails, retills, riblets, rillets, risible, saltier, sillier, siltier, slatier, stabler, stellar, stifler, stiller, tallier, tallies, tillers, trellis, triable, tribals, trifles