The word underachievement 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 underachievement
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Seven Letter Word Alert: (237 words)
achieve, activer, adenine, amender, amerced, ancient, archive, arenite, arenium, auditee, averted, cairned, cannier, canteen, cantred, carmine, catenin, catered, cavemen, centaur, centred, certain, cerumen, chained, chainer, chaired, chanted, chanter, charmed, charted, cheated, cheater, cheered, chimera, chimere, chinned, chunder, churned, cithern, cranium, creamed, created, cremate, cuneate, curated, curtain, decamer, deceive, decuman, decurve, demerit, dentine, denture, detinue, detrain, detuner, deviant, deviate, diether, dimeter, ditcher, earthed, earthen, echidna, educate, educive, emender, eminent, emirate, enacted, enamine, enchain, enchant, endemic, enhance, enrheum, entered, enteric, enticed, enticer, entrain, erected, eructed, erudite, etheric, evacuee, everted, evicted, evictee, evident, evinced, haircut, hairnet, handier, haunted, haunter, headier, headmen, hearted, hearten, heavier, hectare, hennaed, heretic, humaner, incurve, inducer, inhuman, inreach, intrude, invader, machete, machine, manhunt, manured, marched, matched, matcher, matinee, matured, meander, meatier, medevac, mediate, menaced, merited, metered, methane, minaret, minuter, mitered, munched, munchee, mundane, munited, muriate, natured, needier, neither, nematic, nitrene, nuanced, numeric, racemed, raiment, ranched, reached, reacted, readmit, reamend, reaudit, recaned, receive, rechain, recheat, rechime, recited, reenact, rematch, remated, remined, remnant, renamed, retched, reteach, retimed, retuned, reunite, revenue, rhenium, rheumed, rheumic, riveted, runtime, teacher, teenier, temurah, tenured, therein, thermic, thieved, thinned, thinner, thrived, thunder, tradein, traduce, trained, trainee, tranced, tranche, triaene, tumeric, unaimed, unaired, unarmed, uncared, unchain, unchair, uncharm, uncited, uncrate, uncrime, unearnt, unearth, uneaten, unerect, unhated, unheard, unmatch, unmated, unmeant, unmined, unnamed, unnerve, unrated, unreeve, unrivet, untamed, unteach, untimed, untired, untread, untried, unvaned, uraemic, urinate, uterine, varmint, vaunted, venture, verdict, vermuth, veteran, viaduct, vintner, vraiced