The word countermarch 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: 25
Highest Scoring Words With Friends™ Play In The Letters countermarch
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Seven Letter Word Alert: (66 words)
account, accruer, another, catcher, catechu, centaur, chancre, chanter, charmer, charter, chroman, churner, concert, correct, counter, craunch, creator, crochet, curator, currant, current, enactor, enamour, erratum, haunter, homerun, humaner, manurer, marcher, matcher, maturer, menorah, monarch, mounter, mourner, neuroma, norther, notcher, octamer, octarch, ornater, outearn, outrace, rancher, rancour, reactor, recatch, rechart, recount, rematch, remount, reoccur, retouch, romance, temurah, tonearm, toucher, tranche, trochar, trounce, uncharm, uncrate, unearth, unmatch, unteach, urethra