The word countersignature cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters countersignature
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Seven Letter Word Alert: (606 words)
acerose, acerous, acetone, aconite, actions, acutest, aeriest, agnosic, agonies, agonise, agonist, agoutis, aigrets, airguns, ancient, angrier, anoints, antigen, antsier, arcsine, arenite, argents, arguers, arouser, arsenic, artiest, artsier, astuter, atoners, atonics, atoning, attirer, attires, attunes, auction, augites, augurer, aunties, austere, auteurs, cagiest, canines, cannier, canoers, canteen, canters, canting, cantons, cantors, careens, careers, cargoes, carnies, carouse, carries, carrion, carrots, carters, carting, cartons, casting, catenin, caterer, cations, catogen, cattier, catting, causing, cauters, caution, ceasing, cenotes, censure, centaur, centers, centres, cerates, certain, cistern, citator, citrate, citrons, cittern, coarsen, coarser, coaster, coating, coesite, cognate, cognise, coinage, coiners, congest, consent, consign, contain, content, contest, coreign, corneas, corners, cornets, cornett, cornier, corning, corsage, corsair, costate, costing, coterie, cottage, cotters, cougars, counter, courage, courier, courser, couture, craning, craters, crating, cratons, creaser, creates, creator, cretins, cringer, cringes, cristae, critter, cronies, crosier, cruiser, cuatros, cuneate, curates, curator, curette, curious, currant, current, curries, curring, cursing, curtain, cutouts, cutrate, cutters, cutting, earners, earnest, earning, earring, eastern, egotist, enactor, encores, encrust, engines, enrages, ensnare, ensuing, ensuite, ensurer, enteric, enticer, entices, entrain, entrant, entreat, entries, entrust, erasing, erasure, erector, erotica, erotics, erotise, errants, erratic, estrone, estuate, etaerio, euaster, eugenic, gainers, gaiters, garners, garnets, garotte, garrets, garters, gastric, gastrin, gaunter, gearset, generic, genetic, gentian, genuine, geostat, gestate, gesture, girners, gnostic, goatees, goiters, goitres, goriest, goutier, grainer, granite, grantee, granter, graters, greaser, greaten, greater, greisen, grinner, grister, gritter, groaner, grocers, grouser, grouter, grunter, guanine, guineas, guitars, gunners, gunters, gurners, gustier, gutsier, gutters, igneous, ignores, incants, incense, incrust, inerter, ingrate, insaner, instant, instate, insurer, integer, intense, intents, interns, intoner, intones, intorts, introns, intrust, inturns, iratest, ironage, ironers, iterate, nascent, nastier, nations, natters, nattier, natures, nearest, nearing, neatens, neatest, necrose, nectars, negates, negroes, neonate, nesting, netters, netting, neurons, neuters, neutron, nictate, nitrate, nitrene, nitrous, nonarts, noncute, nonsuit, nonuser, norites, notices, nuances, nursing, nurture, nutcase, nutsier, nutters, nuttier, nutting, octanes, octants, octenes, onstage, oranger, oranges, orating, organic, orients, ornater, otarine, ousting, outages, outcast, outearn, outgain, outgrin, outguns, outings, outrace, outrage, outrant, outrate, outruns, outsang, outsung, outturn, raciest, ragouts, rainout, rancors, rancour, rangers, rangier, ranters, ranting, ratings, rations, ratters, rattier, ratting, rattons, raucous, reactor, reagent, reargue, rearing, rearise, rearose, recanes, recants, reciter, recites, recoats, recoins, recount, recrate, recruit, rectors, recures, recurse, reenact, regains, regears, regents, regions, regnant, regrant, regrate, regrets, regrout, reigner, reincur, reinter, rennets, renters, renting, rerents, rerinse, reroast, reroute, rescore, rescuer, restage, restain, restart, restate, resting, restore, resurge, retains, retaste, retears, retinas, retints, retires, retoast, retorts, retours, retrace, retract, retrain, retreat, retries, retunes, returns, reunion, reunite, reurges, reusing, reutter, ricotta, rigours, ringers, rioters, roaning, roaring, roaster, roister, rongeur, roseate, rosette, rotates, rotters, rotting, rousing, routers, routine, routing, rugrats, ruinous, runners, runnier, runtier, rustier, rusting, ruttier, rutting, saucier, saucing, saunter, scanner, scanter, scarier, scaring, scatter, scenter, scoriae, scoring, scorner, scourer, scourge, scouter, scrouge, seagoer, searing, seating, section, securer, senator, seriate, serrate, setting, signora, sincere, sinuate, situate, snaring, snoring, snorter, snotter, soaring, sorting, souring, stagier, stainer, stannic, staring, starter, statice, stating, station, stature, sterane, sterner, stinger, stonier, stoning, storage, storing, stourie, stouter, straint, strange, striate, stunner, stunter, suction, sugarer, sunnier, surgeon, tangent, tangier, tanners, tannest, tantric, targets, tarries, tarring, tastier, tasting, taunter, tautens, tauting, tearers, tearier, tearing, teasing, tenants, tenners, tensing, tension, tentage, tenters, tentier, tenting, tenuous, tenures, ternate, terrace, terrain, terrane, testier, testing, tetanic, tetanus, teutons, tinners, tinters, toaster, tongues, tonnage, tonsure, torrent, torture, toucans, tourers, touring, tourist, touters, touting, tracers, tracing, tractor, trainee, trainer, traitor, trances, transit, treason, treater, treeing, triaene, triages, tricots, trienes, triones, trisect, trocars, trounce, trouser, truants, trustee, truster, tunings, turgors, turners, turning, turnout, turrets, tutoree, tutorer, uncages, uncarts, uncrate, unction, uncurse, uneager, unearnt, uneaten, unerect, unguent, unicorn, uniters, unreset, unrisen, unstage, unstain, unstoic, untruer, ureters, uricase, urinate, urostea, uterine, utterer