The word countersign 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: 19
Highest Scoring Words With Friends™ Play In The Letters countersign
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Seven Letter Word Alert: (94 words)
cistern, citrons, cognise, coiners, congest, consent, consign, coreign, cornets, corning, costing, counter, cretins, cringes, cronies, cursing, encrust, ensuing, erotics, gnostic, goiters, goitres, goriest, goutier, gunners, gunters, gustier, gutsier, igneous, ignores, incrust, interns, intoner, intones, introns, inturns, nesting, neurons, neutron, nitrous, noncute, nonsuit, nonuser, norites, notices, nursing, nutsier, orients, ousting, outgrin, outings, recoins, recount, regions, renting, resting, reunion, reusing, rousing, routine, routing, rusting, scoring, scourge, scouter, scrouge, section, snoring, sorting, souring, stinger, stonier, stoning, storing, stourie, stunner, suction, sunnier, surgeon, tensing, tension, tinners, tongues, tonsure, touring, triones, trounce, tunings, turning, unction, unicorn, uniters, unrisen, unstoic