The word countersignatures cannot be made in Words With Friends™. It is 17 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters countersignatures
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Seven Letter Word Alert: (797 words)
acerose, acerous, acetone, aconite, actions, actress, acutest, aeriest, agnosic, agonies, agonise, agonist, agoutis, aigrets, airguns, ancient, ancress, angrier, anoints, antigen, antsier, arcsine, arenite, argents, arguers, arouser, arouses, arrests, arsenic, artiest, artists, artsier, ascents, ascites, astuter, atoners, atonics, atoning, attirer, attires, attunes, auction, augites, augurer, augusts, aunties, austere, auteurs, autists, cagiest, caisson, canines, cannier, canoers, canteen, canters, canting, cantons, cantors, careens, careers, cargoes, carnies, carouse, carries, carrion, carrots, carters, carting, cartons, caseins, casings, casinos, casters, casting, castors, catenin, caterer, cations, catogen, cattier, catting, causers, causing, cauters, caution, ceasing, cenotes, censers, censors, censure, centaur, centers, centres, cerates, cerises, certain, cession, cistern, citator, citrate, citrons, cittern, coarsen, coarser, coaster, coating, coesite, cognate, cognise, coinage, coiners, congest, consent, consign, consist, contain, content, contest, coreign, corneas, corners, cornets, cornett, cornier, corning, corsage, corsair, corsets, cosiest, cosigns, cosines, costars, costate, costing, coterie, cottage, cotters, cougars, counter, courage, courier, courser, courses, cousins, couture, craning, crasser, craters, crating, cratons, creaser, creases, creates, creator, cresset, cretins, cringer, cringes, cristae, critter, cronies, crosier, crosser, cruiser, cruises, cuatros, cuneate, curates, curator, curette, curious, currant, current, curries, curring, cursers, cursing, cursors, curtain, cussing, cutouts, cutrate, cutters, cutting, earners, earnest, earning, earring, easiest, eastern, egoists, egotist, enactor, encases, encores, encrust, engines, engross, enrages, ensears, ensigns, ensnare, ensuing, ensuite, ensurer, ensures, enteric, enticer, entices, entrain, entrant, entreat, entries, entrust, erasers, erasing, erasure, erector, erotica, erotics, erotise, errants, erratic, escorts, estates, estrone, estrous, estuate, etaerio, euaster, eugenic, gainers, gaiters, garners, garnets, garotte, garrets, garters, gaseous, gassier, gastric, gastrin, gaunter, gearset, generic, genesis, genetic, gentian, genuine, genuses, geostat, gestate, gesture, girners, gnostic, goatees, goiters, goitres, goriest, goutier, grainer, granite, grantee, granter, graters, greaser, greases, greaten, greater, greisen, grinner, grister, gritter, groaner, grocers, grosser, grouser, grouses, grouter, grunter, guanine, guesser, guineas, guitars, gunners, gunters, gurners, gustier, gutsier, gutters, igneous, ignores, incants, incense, incests, incrust, inerter, ingests, ingrate, ingress, insaner, insects, inserts, instant, instars, instate, insurer, insures, 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, nesters, nesting, netters, netting, neurons, neuters, neutron, nictate, nitrate, nitrene, nitrous, nonarts, noncute, nonsuit, nonuser, norites, noseans, nosiest, notices, notists, nuances, nursers, nursing, nurture, nutcase, nutsier, nutters, nuttier, nutting, octanes, octants, octenes, oecists, oestrus, oneness, onstage, oranger, oranges, orating, organic, orients, ornater, otarine, ousters, ousting, outages, outcast, outearn, outgain, outgrin, outguns, outings, outrace, outrage, outrant, outrate, outruns, outsang, outsees, outsets, outsits, outsung, outturn, raciest, racists, ragouts, rainout, raisers, rancors, rancour, rangers, rangier, ranters, ranting, rasters, ratings, rations, ratters, rattier, ratting, rattons, raucous, reactor, reagent, reargue, rearing, rearise, rearose, reasons, recanes, recants, recasts, reciter, recites, recoats, recoins, recount, recrate, recross, recruit, rectors, recures, recurse, recuses, reenact, regains, regears, regents, regions, regnant, regrant, regrate, regress, regrets, regrout, reigner, reincur, reinter, reissue, renests, rennets, renters, renting, rerents, rerinse, reroast, reroute, rescans, rescore, rescuer, rescues, reseats, resects, resents, resigns, resorts, restage, restain, restart, restate, resters, resting, restirs, restore, resurge, retains, retaste, retears, retests, retinas, retints, retires, retoast, retorts, retours, retrace, retract, retrain, retreat, retries, retunes, returns, reunion, reunite, reurges, reusing, reutter, ricotta, rigours, ringers, rinsers, rioters, roaning, roaring, roaster, roister, rongeur, roseate, rosette, rosiest, rosters, rotates, rotters, rotting, rousing, routers, routine, routing, rugrats, ruinous, runners, runnier, runtier, rustics, rustier, rusting, ruttier, rutting, sagiest, sanctus, sateens, satires, saucers, saucier, saucing, saunter, scanner, scanter, scarers, scarier, scaring, scatter, scenter, scorers, scoriae, scorias, scoring, scorner, scourer, scourge, scouter, screens, scrouge, seagoer, seances, searing, seaters, seating, secants, secerns, secrets, section, sectors, securer, secures, seitans, seitens, senates, senator, seniors, sensate, sensing, seriate, serious, serrate, sestina, sestine, setters, setting, siennas, sierras, signees, signers, signets, signora, signors, sincere, singers, sinners, sinters, sinuate, sinuous, sitters, situate, snarers, snaring, snorers, snoring, snorter, snotter, soarers, soaring, soirees, sonnets, sorters, sorties, sorting, sources, sourest, souring, sringas, stagers, stagier, stainer, stances, stannic, starers, staring, starter, staters, statice, statics, stating, statins, station, statues, stature, stenose, sterane, stereos, sterner, stetson, stinger, stogies, stoners, stonier, stoning, storage, stories, storing, stourie, stouter, strains, straint, straits, strange, stratus, streets, striate, strings, stunner, stunter, sucrase, sucrose, suction, sugarer, suiters, suitors, sunnier, sunnies, sunrise, sunstar, suntans, surgeon, surgers, sustain, sutures, tangent, tangier, tanners, tannest, tantric, taoists, targets, tarries, tarring, tasters, tastier, tasting, taunter, tautens, tauting, tearers, tearier, tearing, teasers, teasing, tenants, tenners, tensest, tensing, tension, tensors, tentage, tenters, tentier, tenting, tenuous, tenures, ternate, terrace, terrain, terrane, tersest, testers, testier, testing, tetanic, tetanus, teutons, tigress, tinners, tinters, toaster, tocsins, tongues, tonnage, tonsure, torrent, torture, toruses, tossing, 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, tsarist, tunings, turgors, turners, turning, turnout, turrets, tutoree, tutorer, uncages, uncarts, uncrate, uncross, unction, uncurse, uneager, unearnt, uneaten, unerect, unguent, unicorn, uniters, unreset, unrests, unrisen, unseats, unsorts, unstage, unstain, unstoic, untruer, ureases, ureters, uricase, urinate, urostea, uterine, utterer