The word barrelfishes 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: 21
Highest Scoring Words With Friends™ Plays In The Letters barrelfishes
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Seven Letter Word Alert: (80 words)
abseils, airless, barrels, bashers, bearers, bearish, beerish, beliefs, berries, blesser, braiser, braises, braless, brasher, brasier, briefer, earless, earlier, erasers, faeries, febrile, ferries, fishers, flasher, flashes, fleshes, frailer, freesia, fresher, friable, frisbee, healers, hearers, hearses, heifers, heiress, herbals, herself, hisself, lashers, leafier, leasers, leashes, raisers, rashers, realers, realise, rearise, rebales, rebases, rebless, rebrief, refiles, refires, reflash, reflies, refresh, refries, rehears, rehires, reliefs, reliers, resails, resales, reseals, reshare, ribless, riflers, sailers, sealers, sealife, selfies, selfish, serials, shalier, sharers, shearer, sherifs, sierras, slasher