The word presupposing is playable in Words With Friends™, but 1 blank substituting for the letter 'p' is 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: 21
Highest Scoring Words With Friends™ Plays In The Letters presupposing
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Seven Letter Word Alert: (66 words)
engross, groupie, grouses, guppies, igneous, ignores, ingress, insures, nippers, oppress, pepping, pepsins, persons, pigeons, pigpens, pingers, pingoes, popguns, poppers, poppies, popping, poseurs, pouring, pressup, prisons, propine, puppies, pupping, purines, purpose, pursing, pussier, regions, resigns, respins, reusing, rousing, seniors, serious, signers, signors, singers, sippers, snipers, snipper, soppers, soppier, sopping, soupier, souping, souring, spinose, spinous, sponger, sponges, sporing, springs, spurges, sunrise, suppers, supping, suppose, surgeon, suspire, uprisen, uprises