The word keratinises 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: 16
Highest Scoring Words With Friends™ Play In The Letters keratinises
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Seven Letter Word Alert: (67 words)
aeriest, airiest, antsier, arenite, earnest, easiest, eastern, ensears, entries, inertia, inkiest, inserts, instars, intakes, irisate, kainite, kaisers, karites, keratin, kernite, kinases, kineses, kinesis, nastier, nearest, nesters, raisins, rankest, reknits, renests, reseats, resents, restain, restake, retains, retaken, retakes, retasks, retinas, sateens, satires, seaters, seitans, seitens, senates, sensate, seriate, sestina, sestine, sinkers, sinters, skaters, snakier, sneaker, stainer, sterane, stinker, strains, streaks, strikes, tankers, taskers, teasers, tinkers, trainee, triaene, trienes