The word scrappiest 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: 19
Highest Scoring Words With Friends™ Plays In The Letters scrappiest
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Seven Letter Word Alert: (54 words)
actress, apprise, ascites, aseptic, aspects, aspires, carpets, casspir, casters, cesspit, crappie, cristae, epicarp, escarps, icespar, paresis, parsecs, parties, pasters, pastier, pasties, persist, picrate, pirates, praises, precast, priests, raciest, racists, rapists, recasts, repasts, sappers, sappier, satires, scrapes, scripts, septics, sippers, spacers, spacier, sparest, spastic, spectra, spicate, spicers, spireas, spriest, sprites, stripes, tappers, tippers, traipse, triceps