The word hyperextending 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: 33
Highest Scoring Words With Friends™ Play In The Letters hyperextending
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Seven Letter Word Alert: (66 words)
dentine, denting, denying, deterge, dextrin, dienyne, diether, eighter, engined, entered, epigene, exerted, exigent, expired, greened, greeted, grinned, heeding, heptene, heptyne, herding, hygiene, indepth, indexer, inepter, integer, needier, needing, neighed, neither, nitrene, peering, pendent, pending, pentene, pentyne, perigee, petered, preedit, preened, preteen, pretend, preying, printed, rehinge, reigned, reindex, rending, reneged, renting, repined, retying, retyped, righted, ripened, teenier, tending, tepider, terpene, terpine, therein, thinned, thinner, tindery, treeing, yperite