The word spleenwort 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: 18
Highest Scoring Words With Friends™ Play In The Letters spleenwort
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Seven Letter Word Alert: (32 words)
elopers, estrone, leptons, onestep, openers, openest, pelters, pentose, petrels, petrols, pewters, plowers, plowter, postern, poteens, prenote, present, pronest, relents, reopens, repents, replots, replows, respelt, reswept, roselet, serpent, swelter, trowels, western, wrenlet, wrestle