The word parenterally 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: 20
Highest Scoring Words With Friends™ Play In The Letters parenterally
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Seven Letter Word Alert: (40 words)
alerter, alertly, allayer, analyte, aplenty, arylate, enteral, eternal, lateral, learner, narrate, paleate, parrell, partner, patella, penalty, planeta, plantar, planter, playlet, plenary, prelate, prelaty, pteryla, realter, reentry, relater, relayer, relearn, repanel, repayal, replane, replant, replate, repleat, retally, taperer, ternary, terrane, yearner