The word rhinencephalon 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: 28
Highest Scoring Words With Friends™ Play In The Letters rhinencephalon
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Seven Letter Word Alert: (62 words)
aileron, airhole, alphorn, caliper, calorie, cannier, cannoli, chainer, channel, cheapen, cheaper, cheerio, chlorin, cholera, choline, chorale, clarion, cleaner, coalier, corneal, echelon, enchain, enhance, epochal, harelip, heparin, hernial, heroine, inhaler, inplace, inreach, leacher, nephron, nonepic, nonleap, nonliar, nonreal, onliner, opaline, panicle, pelican, penance, phonier, phrenic, pincher, pinhole, pioneer, plainer, planner, poacher, polaric, porcine, praline, proline, rechain, reclean, recline, reclone, repanel, replace, replane, replica