The word inevitableness 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™ Play In The Letters inevitableness
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Seven Letter Word Alert: (81 words)
abseils, absents, albites, alibies, aniline, asinine, astilbe, baleens, beanies, beeline, beetles, believe, beslave, biennia, easiest, elastin, elative, elevate, elevens, enables, enlists, enliven, enseals, enslave, entails, estival, evenest, evilest, ilvaite, inlines, intense, invents, invests, invitee, invites, lateens, leanest, leavens, lenient, lenites, lesbian, liaises, libates, lineate, linnets, listens, nailset, naivest, natives, neatens, nestles, netless, salient, salines, sateens, seeable, seitans, seitens, senates, sensate, sestina, sestine, siennas, silanes, silents, silvans, sleaves, sleeves, snivels, stables, steelie, tealess, teasels, tenable, tensile, tieless, tinsels, vainest, veinlet, vinelet, visible