The word mesencephalon 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: 27
Highest Scoring Words With Friends™ Play In The Letters mesencephalon
:
Seven Letter Word Alert: (47 words)
achenes, alpeens, anemone, cephems, channel, chanson, chapels, cheapen, cheapos, cleanse, cleomes, coalmen, compels, echelon, empanel, emplace, emplane, enamels, encalms, encamps, enclasp, enclose, enhance, enolase, epochal, escapee, leaches, leeches, manhole, menaces, nonleap, nonmale, nonmeal, nonsale, pacemen, peaches, penance, pencase, penname, phenols, phoneme, plasmon, poaches, scalene, shopman, shopmen, spelean