The word nonpasserine 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 nonpasserine
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Seven Letter Word Alert: (51 words)
asperse, aspires, ensears, ensnare, insaner, nannies, nonanes, nonenes, nonsane, noseans, oneness, openers, pansies, paresis, parsons, passion, penises, penners, pennies, pension, peonies, persona, persons, pinenes, pioneer, poesies, praises, prisons, reasons, rennins, reopens, repines, reposes, resnaps, respans, respins, saponin, seniors, serapes, siennas, sinners, snipers, soapers, soapier, soirees, spanner, spinner, spinons, spinose, spireas, sprains