The word underwrites 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: 17
Highest Scoring Words With Friends™ Plays In The Letters underwrites
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Seven Letter Word Alert: (91 words)
deniers, denture, dernier, derries, desirer, destine, detinue, detuner, detunes, dewiest, dewires, diester, dieters, dunites, dustier, endures, ensuite, ensured, ensurer, entries, erudite, inerter, insured, insurer, intrude, nerdier, neuters, newsier, nutseed, nutsier, redries, reedits, reinter, renders, renters, rerents, rerinse, resider, residue, retired, retires, retried, retries, retuned, retunes, returns, retwine, reunite, rewinds, rewired, rewires, rewrite, rudites, runtier, rustier, sinewed, sterned, sterner, stirred, strewed, strider, studier, tenders, tenured, tenures, tinders, tireder, trienes, turners, turrids, twiners, undrest, uniters, unreset, unsweet, untired, untried, unwired, unwiser, ureters, uterine, weiners, weirder, western, widener, wieners, winders, winters, wrested, wrester, writers