The word nonreturnable 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: 21
Highest Scoring Words With Friends™ Play In The Letters nonreturnable
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Seven Letter Word Alert: (54 words)
abluent, abortee, aborter, alerter, annulet, aureole, baronet, bleater, bloater, blunter, blurter, bonelet, butanol, earlobe, enabler, ennoble, enolate, enrober, enteral, eternal, laborer, lantern, learner, nebulae, nebular, neonate, neutral, neutron, nonlate, nonreal, notable, ornater, outearn, realter, realtor, rebater, reblent, relater, relearn, reroute, rubeola, taboule, tenable, terrane, toluene, trouble, trunnel, tunable, unalert, unalter, unblent, unearnt, uneaten, unlearn