The word rhombencephalon 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: 34
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (85 words)
almoner, alphorn, anemone, armhole, belcher, bloomer, blooper, boolean, camphor, cannolo, carbeen, carbene, carpool, chamber, channel, cheapen, cheaper, cholera, chomper, chorale, chroman, chromel, clamber, clamper, cleaner, coalmen, compare, compere, corneal, coronal, crampon, earlobe, echelon, embrace, empanel, emplace, emplane, enabler, enhance, ennoble, epochal, harpoon, hencoop, honoree, hormone, lampoon, leacher, manhole, menorah, monarch, monocle, moocher, moorhen, moorpan, morphon, nephron, nonamer, noncola, nonhero, nonleap, nonmale, nonmeal, nonreal, pacemen, penance, penname, phoneme, placebo, planner, poacher, polaron, precool, problem, reblame, rebloom, reclamp, reclean, reclone, repanel, replace, replane, repoman, romance, ropeman, ropemen