The word keratohyalin 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: 22
Highest Scoring Words With Friends™ Plays In The Letters keratohyalin
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Seven Letter Word Alert: (52 words)
aeolian, aileron, airhole, analyte, another, antlike, arylate, earthly, elation, elkhorn, enthral, ethanol, hairnet, hayrake, hernial, hotline, hotlink, hyaline, hyalite, inertly, inhaler, inlayer, irately, kaoline, keratin, kyanite, lankier, lathery, latrine, loather, oarlike, oatlike, otarine, rainhat, rathole, ratlike, ratline, raylike, reality, reliant, rethank, rethink, retinal, retinol, tearily, thanker, thinker, tinkler, toenail, toylike, trenail, yolkier