The word reversionist 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™ Play In The Letters reversionist
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Seven Letter Word Alert: (88 words)
entries, enviers, erosive, erotise, estrone, inerter, inosite, inserts, inverse, inverts, invests, invitee, inviter, invites, invitro, ioniser, ionises, ironers, ironies, ivories, ivorist, nervier, nesters, noisier, norites, nosiest, orients, overset, oversit, reinter, renests, renters, rerents, rerinse, resents, resorts, resters, restirs, restive, restore, retires, retries, reverts, reviser, revises, revisit, revotes, rinsers, rioters, riveter, roister, rosiest, rosters, seitens, seniors, servers, sestine, sievert, sinters, snorers, snorter, soirees, sorters, sorties, stenose, stereos, sterner, stivers, stivier, stoners, stonier, stories, striven, striver, strives, tensors, trienes, triones, veinier, verists, versine, version, vetoers, virions, visions, visitor, vitrine, voteens