The word understructure 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: 22
Highest Scoring Words With Friends™ Play In The Letters understructure
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Seven Letter Word Alert: (74 words)
censure, centers, centred, centres, crested, crudest, crusted, curette, current, cutters, decrust, denture, descent, detects, detents, detuner, detunes, encrust, endures, ensured, ensurer, entrust, eructed, netters, neuters, nurture, nutseed, nutters, recured, recures, recurse, recused, reducer, reduces, reducts, renders, renters, rerents, rescued, rescuer, retuned, retunes, returns, reutter, scented, scenter, secured, securer, seducer, stented, sterned, sterner, student, stunted, stunter, sutured, tenders, tenters, tenured, tenures, trusted, trustee, truster, turners, turrets, uncured, uncurse, undrest, unerect, unreset, untruer, ureters, uttered, utterer