The word uncorroborated 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: 23
Highest Scoring Words With Friends™ Play In The Letters uncorroborated
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Seven Letter Word Alert: (87 words)
aborted, aborter, adorner, arbored, barcode, baronet, bartend, boarder, bounced, bouncer, bounder, bracted, bradoon, brander, broaden, broader, brocade, brooder, cantred, cartoon, centaur, contour, cordate, cordoba, coroner, coronet, corrode, counted, counter, courted, creator, crooned, crooner, crouton, crunode, curated, curator, currant, current, doubter, ecotour, eductor, enactor, natured, obtrude, octoban, october, odorant, onboard, ornater, outbade, outbred, outdare, outdoer, outdone, outdoor, outearn, outrace, outread, outroar, outrode, rancour, reactor, readorn, readout, reboard, rebound, rebrand, recount, redoubt, redroot, rotunda, rounder, tabooed, tacnode, tornado, traduce, tranced, trounce, unboard, unbrace, uncared, uncored, uncrate, unrated, unrobed, untread