The word underdevelopment cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters underdevelopment
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Seven Letter Word Alert: (127 words)
deepend, deerlet, deleted, deleter, deluder, demerol, demoted, demount, dendron, denoted, denture, denuder, deplete, deplore, deplume, deponed, deputed, detrend, detrude, detuned, detuner, develop, devoted, devotee, dovelet, droplet, element, emended, emender, endnote, endured, entered, envelop, envenom, erupted, eudemon, everted, lemoned, levered, louvred, meddler, metered, modeled, modeler, mordent, moulded, moulder, moulted, mounded, mounted, mounter, mourned, muddler, needled, needler, neutron, noduled, nondeep, nonmute, opulent, overdue, overled, peddler, pendent, pentene, pentode, permute, petered, plodder, plouter, plunder, portend, poulter, pounded, pounder, preened, prelude, premeet, premelt, premold, prenote, preteen, pretend, prevent, prudent, puddler, redound, redpole, remodel, remould, remound, remount, removed, replete, reputed, retuned, reveled, revenue, revoted, ropemen, rounded, roundel, rumpled, telomer, tempore, tenured, terpene, toddler, toluene, trended, trodden, trouped, trumped, trundle, trunnel, umpteen, undoped, unended, unloved, unmoved, unnerve, unnoted, unreeve, upended, uptrend, venture, volumed