The word paleocortex 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: 25
Highest Scoring Words With Friends™ Plays In The Letters paleocortex
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Seven Letter Word Alert: (23 words)
caltrop, carpool, elector, exacter, exactor, exalter, excerpt, excreta, exocarp, explore, extoler, locator, operate, poleaxe, polecat, precoat, precool, prelate, prelect, replace, replate, repleat, treacle