The word uninsurable 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: 19
Highest Scoring Words With Friends™ Play In The Letters uninsurable
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Seven Letter Word Alert: (28 words)
annulus, auburns, banners, bunnies, bureaus, burials, ensnarl, insaner, insular, inulase, lesbian, nailers, nebular, nebulas, neurula, renails, runnels, suberin, subrail, subrule, sunburn, sunnier, unbales, unblurs, unlearn, unrisen, unsnarl, urinals