The word gynarchies 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: 20
Highest Scoring Words With Friends™ Play In The Letters gynarchies
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Seven Letter Word Alert: (41 words)
arching, arcsine, arsenic, arshine, carnies, cashier, cashing, ceasing, chagrin, chainer, changer, changes, charges, chasing, chrysin, cringes, cryings, cyanise, erasing, gainers, garnish, gnasher, grayish, greyish, gynarch, hangers, hearing, hernias, inchers, inreach, ranches, rechain, regains, rehangs, scaring, scrying, searing, sharing, synarch, syringa, syringe