The word oppressiveness 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: 25
Highest Scoring Words With Friends™ Play In The Letters oppressiveness
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Seven Letter Word Alert: (43 words)
enviers, erosive, inverse, nippers, openers, oppress, osseins, oversee, peepers, peevers, penises, pensive, peonies, pepsins, persons, pioneer, poesies, possess, presses, prisons, propene, propine, reopens, repines, repipes, reposes, respins, revises, seepier, seniors, sensors, session, sippers, snipers, snipper, soirees, soppers, soppier, spinose, veneers, versine, version, vespers