The word palingeneses 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: 20
Highest Scoring Words With Friends™ Play In The Letters palingeneses
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Seven Letter Word Alert: (56 words)
ageless, alpeens, alpines, elapses, elegies, elegise, engines, enseals, ensigns, epigene, gapless, geneses, genesis, genials, lapsing, leaning, leaping, leasing, lensing, ligases, lineage, lipases, napless, palsies, pansies, passing, pealing, peeling, pegless, penises, pennies, pieless, pinenes, pingles, pinless, planing, pleases, salines, sapling, sealing, seepage, seeping, sensing, siennas, signals, signees, silanes, singles, spangle, spaniel, spelean, spiegel, spinals, spinels, spleens, splines