The word undercurrents 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: 21
Highest Scoring Words With Friends™ Play In The Letters undercurrents
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Seven Letter Word Alert: (63 words)
censure, centers, centred, centres, crested, crudest, crusted, current, decrust, denture, descent, detuner, detunes, encrust, endures, ensured, ensurer, eructed, neuters, nurture, nutseed, recured, recures, recurse, recused, reducer, reduces, reducts, renders, rennets, renters, rerents, rescued, rescuer, retuned, retunes, returns, runners, scented, scenter, secured, securer, seducer, sterned, sterner, stunned, stunner, sutured, tenders, tenners, tenured, tenures, turndun, turners, uncured, uncurse, undents, undrest, unerect, unreset, untruer, untuned, ureters