The word countersuit 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 countersuit
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Seven Letter Word Alert: (57 words)
cistern, citrons, cittern, coiners, contest, cornets, cornett, cotters, counter, couture, cretins, cronies, curious, cutouts, cutters, encrust, entrust, erotics, incrust, intorts, intrust, nitrous, norites, notices, nutsier, nutters, nuttier, orients, outruns, outturn, recoins, recount, retints, routine, ruinous, scouter, section, snotter, stonier, stourie, stouter, stunter, suction, tenuous, teutons, tinters, tonsure, tourist, touters, tricots, triones, trisect, trounce, turnout, uncurse, uniters, unstoic