The word matriarchates 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: 21
Highest Scoring Words With Friends™ Play In The Letters matriarchates
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Seven Letter Word Alert: (97 words)
acaters, achiest, aitches, amastia, amritas, archaea, archers, armrest, artiest, artsier, atheism, atheist, atresia, attache, attirer, attires, cameras, cariama, carries, carters, cashier, catarrh, cattier, charier, charmer, charter, chaster, chatter, chemist, chimera, cithers, citrate, crasher, craters, cristae, critter, erratic, hamster, hastate, hastier, hatters, hermits, hitters, iratest, maracas, marasca, marcher, marches, marries, mascara, matcher, matches, matters, metrics, metrist, mishear, raciest, ratchet, ratrace, ratters, rattier, rattish, rechart, reharms, rematch, restart, retract, retrims, richest, sariama, satiate, scarier, scatter, shatter, smarter, smartie, smatter, starter, statice, stretch, striate, tarmacs, tarries, tartars, tartish, tastier, teacart, thermic, threats, tithers, tracers, trachea, tramcar, trasher, triarch, trimers, trisect