The word peritoneal 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: 15
Highest Scoring Words With Friends™ Play In The Letters peritoneal
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Seven Letter Word Alert: (56 words)
aileron, arenite, elation, enolate, enteral, etaerio, eternal, inepter, latrine, lineate, nepotal, opaline, operant, operate, otarine, painter, peatier, penlite, pentail, perlite, pertain, petiole, pioneer, plainer, planter, pointer, politer, praline, prelate, prenote, proline, pronate, protean, protein, ratline, reliant, repaint, repanel, repilot, replait, replane, replant, replate, repleat, repoint, reptile, retinal, retinol, terpine, toenail, topline, toprail, trainee, trenail, triaene, tripole