The word balloonfishes 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 balloonfishes
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Seven Letter Word Alert: (40 words)
abioses, abolish, abseils, albinos, balloon, bassoon, befalls, bonsais, boolean, fashion, finales, finless, flashes, foliole, follies, foolish, hisself, hobnail, hollies, illness, inhales, insoles, isohels, lesbian, lesions, lioness, lobefin, lobelia, loofahs, loonies, loosens, losable, olefins, oleosin, sabinos, salines, saloons, sealion, selfish, silanes