The word underestimated 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: 21
Highest Scoring Words With Friends™ Plays In The Letters underestimated
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Seven Letter Word Alert: (342 words)
admired, admires, aeriest, amended, amender, aniseed, antsier, arenite, arenium, aridest, artiest, artsmen, astride, astuter, asunder, atriums, attends, attired, attires, attuned, attunes, audited, auditee, aunties, austere, damners, danders, dandier, dandies, daunted, deadens, deadest, deadmen, deaired, dearest, dearies, demands, demated, demates, demeans, dements, demerit, demesne, demised, deniers, dentate, dentist, denture, denuder, denudes, derides, desired, destain, destine, detains, detente, detents, detinue, detrain, detrend, detrude, detuned, detuner, detunes, diadems, diester, dieters, dimeter, disrate, distant, distend, drained, dreamed, dresden, dunites, durians, dustier, dustman, dustmen, earnest, eastern, eeriest, emended, emender, emersed, emirate, emitted, emitter, endears, endured, endures, enemies, ensuite, ensured, entered, entreat, entrees, entries, entrust, erudite, estuate, euaster, inmates, instate, instead, insured, intrude, intrust, iratest, itemset, iterate, maddens, madders, maddest, maidens, manured, manures, marines, martens, martins, matinee, matters, matured, matures, meander, meanest, meanies, measure, meatier, medians, mediate, medusae, meeters, menders, merited, metered, metrise, metrist, middens, minaret, minders, mindset, minters, minuets, minuter, minutes, misdate, misdeed, misread, mistune, misturn, mitered, mittens, muddier, muddies, munited, munites, muriate, mustard, mustier, mutants, mutated, mutates, mutters, nastier, natters, nattier, natured, natures, nearest, neatest, needers, needier, netters, neuters, nitrate, nutmeat, nutseed, nutsier, nutters, nuttier, radiums, raiment, readied, readies, readmes, readmit, reamend, reasted, reaudit, redated, redates, reddens, reddest, redeems, reedits, reemits, reested, remains, remands, remated, remates, remeets, remends, reminds, remined, remines, remints, renamed, renames, resided, residue, restain, restate, resumed, retains, retaste, reteams, retimed, retimes, retinas, retints, retuned, retunes, reunite, ruddies, rudites, runtime, sainted, sandier, sardine, saunter, sauteed, seamier, sedated, sedater, seedier, seminar, seriate, seriema, sidearm, sideman, sinuate, sirname, situate, smarted, smarten, smartie, smatter, smeared, smitten, smutted, sneered, stadium, stained, stainer, standee, stander, started, statued, stature, steamed, steamer, steered, stented, sterane, sterned, sternum, stinted, straint, stratum, striate, student, studied, studier, stunted, stunter, sudated, surname, tainted, tandems, tantrum, tasered, tastier, taunted, taunter, tautens, teatime, teddies, tediums, teemers, teenier, teeters, tenders, tenters, tentier, tenured, tenures, termite, ternate, testier, tetanus, tinders, tinters, tirades, tradein, trained, trainee, transit, treaded, treated, trended, triaene, tridems, trident, trienes, truants, trusted, trustee, tsunami, tundras, unaided, unaimed, unaired, unarmed, undated, undrest, undried, uniters, unmated, unmates, unrated, unreset, unsated, untamed, untimed, untired, untread, untried, urinate, uterine, uttered