The word pearlfishes 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™ Plays In The Letters pearlfishes
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Seven Letter Word Alert: (76 words)
airless, asperse, aspires, earless, elapses, faeries, felspar, fishers, flasher, flashes, fleshes, freesia, hapless, harelip, harpies, healers, heapers, hearses, heifers, heiress, helpers, herself, hisself, lashers, leafier, leapers, leasers, leashes, lipases, lispers, palsies, paresis, phrases, pieless, pilfers, plasher, plashes, pleaser, pleases, praises, prefile, presale, raspish, realise, refiles, reflash, reflies, reflips, reheaps, relapse, reliefs, repeals, repiles, replies, resails, resales, reseals, reshape, reships, sailers, sealers, sealife, selfies, selfish, serapes, seraphs, serials, shalier, shapers, sharpie, sherifs, sherpas, slasher, spheres, spirals, spireas