The word underachiever 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: 25
Highest Scoring Words With Friends™ Plays In The Letters underachiever
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Seven Letter Word Alert: (71 words)
achieve, adherer, archive, arrived, averred, cairned, carried, chained, chainer, chaired, charier, charred, cheered, cheerer, chunder, churned, churner, curried, curvier, deceive, decreer, decrier, decurve, deriver, dernier, drainer, echidna, educive, evacuee, evinced, handier, hardier, headier, heavier, hurried, incurve, inducer, inreach, invader, needier, nerdier, nervier, ranched, rancher, randier, reached, reacher, readier, recaned, receive, rechain, recured, recurve, redrive, reducer, reedier, reheard, rehired, reincur, renerve, revenue, revered, reverie, rivered, unaired, uncared, unchair, unheard, unreeve, verdure, vraiced