The word hyperextends 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: 28
Highest Scoring Words With Friends™ Plays In The Letters hyperextends
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Seven Letter Word Alert: (47 words)
deepens, deepest, entered, entrees, ethenes, ethynes, exerted, expends, expense, experts, extends, heptene, heptyne, hexenes, hexynes, needers, petered, pheesed, phrensy, preened, present, preteen, pretend, redeyes, reested, repents, retyped, retypes, seethed, seether, serpent, sheered, sheeted, sheeter, sneered, speeder, spender, sphered, steeped, steepen, steeper, steered, sterned, styrene, tenders, terpene, yestern