The word nonfissionable 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™ Plays In The Letters nonfissionable
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Seven Letter Word Alert: (49 words)
abioses, abiosis, abseils, albinos, alibies, aniline, asinine, bassoon, biennia, bifolia, bonsais, boolean, elision, finales, finials, finless, fissile, fission, inlines, inosine, insoles, ionises, ionones, lesbian, lesions, liaises, liaison, lioness, lionise, lobefin, loonies, loosens, nannies, nanobes, nonanes, nonfans, nonlife, nonsale, nonsane, nonself, noseans, olefins, oleosin, sabinos, salines, saloons, sealion, siennas, silanes