The word underperforms 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 underperforms
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Seven Letter Word Alert: (83 words)
deforms, defuser, demurer, depones, deposer, dormers, dumpers, emperor, endorse, endures, ensured, ensurer, eudemon, fenders, ferrous, fondues, foremen, formers, forseen, founder, freedom, frumped, funders, menders, moderns, mourned, mourner, murders, openers, orderer, perform, perfume, perfuse, perused, ponders, pounder, pourers, prefers, preform, prefund, presume, profuse, prouder, pruners, reforms, refound, refunds, refused, refuser, remends, remorse, remound, renders, reopens, reorder, reposed, reposer, repours, reprune, resound, respond, resumed, resumer, rompers, ropemen, rounder, ruesome, rumored, serfdom, sounder, spender, spondee, spurned, spurner, spurred, spurrer, supered, supreme, undoers, unforms, unfreed, unposed, uromere