The word crenellated 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: 18
Highest Scoring Words With Friends™ Play In The Letters crenellated
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Seven Letter Word Alert: (34 words)
alerted, altered, candler, cantred, catered, central, centred, cleaned, cleaner, cleared, created, declare, deerlet, deleter, elected, enacted, enteral, entered, erected, eternal, learned, lectern, needler, reacted, recaned, reclean, redealt, reelect, reenact, relaced, related, tranced, treacle, treadle