The word bladderwracks 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: 29
Highest Scoring Words With Friends™ Play In The Letters bladderwracks
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Seven Letter Word Alert: (74 words)
abraded, abrader, abrades, abrased, abraser, addable, arcades, awarded, awarder, backers, backsaw, balkers, barkers, barrack, barrels, barware, becrawl, bedlars, bedward, blacked, blacker, bladder, bracers, brawled, brawler, cablers, caldera, carders, clawers, cradled, cradles, crakers, crawdad, crawled, crawler, dawdler, dawdles, debarks, decadal, decarbs, declaws, drawbar, drawers, drawled, drawler, ladders, larders, rackers, reaward, rebacks, reclads, recrawl, redraws, reracks, rewalks, rewards, saddler, sawback, scalded, scarred, seaward, slacked, slacker, swaddle, swarded, wadders, waddler, waddles, walkers, warbled, warbler, warbles, warders, wracked