The word coinsurance 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™ Play In The Letters coinsurance
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Seven Letter Word Alert: (37 words)
accrues, accurse, accuser, acerous, arcsine, arsenic, cancers, canines, cannier, canoers, canonic, carnies, carouse, coarsen, cocaine, coiners, concern, concise, concurs, corneas, cornice, cronies, insaner, neurons, nonuser, nuances, oceanic, recoins, reunion, saucier, scanner, scoriac, scoriae, sunnier, unicorn, unrisen, uricase