The word undermentioned 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 undermentioned
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Seven Letter Word Alert: (74 words)
demerit, demoted, demount, dendron, denoted, dentine, denture, denuder, dermoid, detinue, detrend, detrude, detuned, detuner, dimeter, emended, emender, eminent, endnote, endured, entered, erudite, eudemon, intoned, intoner, intrude, inuendo, ioduret, mention, merited, metered, minuter, mitered, mordent, mounded, mounted, mounter, mountie, mourned, muddier, munited, needier, neutron, nitrene, nominee, nondiet, nonmute, onetime, outride, redound, remined, remound, remount, retimed, retuned, reunion, reunite, rounded, routine, runtime, teenier, tenured, trended, trodden, turdoid, undined, undried, unended, unmined, unnoted, untimed, untired, untried, uterine