The word crenelation 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: 17
Highest Scoring Words With Friends™ Play In The Letters crenelation
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Seven Letter Word Alert: (62 words)
acetone, aconite, aileron, aloetic, ancient, antlion, arenite, article, calorie, cannier, cannoli, canteen, catenin, central, certain, clarion, cleaner, coalier, coalite, contain, corneal, coterie, elation, elector, enactor, enolate, enteral, enteric, enticer, entrain, erotica, etaerio, eternal, intoner, lactone, lantern, latrine, lectern, lection, lenient, lineate, neonate, nitrene, nonlate, nonliar, nonreal, onliner, otarine, ratline, recital, reclean, recline, reclone, reenact, reliant, retinal, retinol, toenail, trainee, treacle, trenail, triaene