The word farkleberries 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: 24
Highest Scoring Words With Friends™ Play In The Letters farkleberries
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Seven Letter Word Alert: (60 words)
balkers, balkier, barkers, barrels, barrier, beakers, bearers, beefier, beelike, beliefs, berries, berserk, bilkers, bleaker, braiser, brasier, breaker, briefer, brisker, earlier, faeries, febrile, feebler, feelers, ferrari, ferries, flakier, frailer, freebie, freesia, friable, frisbee, leafier, leakers, leakier, leerier, reakers, realers, realise, rearise, rebakes, rebales, rebrief, reefers, reefier, reekers, reekier, reelers, refiles, refires, reflies, refries, release, reliefs, reliers, riflers, sealife, seeable, skiable, sleeker