The word lizardfishes 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: 28
Highest Scoring Words With Friends™ Plays In The Letters lizardfishes
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Seven Letter Word Alert: (44 words)
aidless, airless, airside, dailies, dairies, daisies, dashers, deliria, derails, dialers, diaries, drazels, fairies, fardels, fishers, fishier, fissile, flashed, flasher, flashes, halides, heralds, hisself, hissier, lashers, liaised, liaises, lizards, redfish, redials, reflash, resails, sailers, selfish, serials, shaders, shadier, shalier, sherifs, shields, sidlers, slashed, slasher, sliders