The word pumpernickel 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: 31
Highest Scoring Words With Friends™ Play In The Letters pumpernickel
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Seven Letter Word Alert: (34 words)
cerumen, clinker, clipper, clumper, clunker, crimple, crinkle, cripple, crumple, cuplike, cuprene, epicure, eupneic, leucine, luckier, lumpier, muckier, numeric, penlike, pickler, plinker, plucker, plumier, plumper, plunker, prepuce, prickle, puerile, pulpier, pumicer, pumpkin, recline, uncrime, urnlike