dunces udnces dnuces nduces undces nudces ducnes udcnes dcunes cdunes ucdnes cudnes dncues ndcues dcnues cdnues ncdues cndues uncdes nucdes ucndes cundes ncudes cnudes dunecs udnecs dnuecs nduecs undecs nudecs duencs udencs deuncs eduncs uedncs eudncs dneucs ndeucs denucs ednucs neducs enducs unedcs nuedcs uendcs eundcs neudcs enudcs ducens udcens dcuens cduens ucdens cudens duecns udecns deucns educns uedcns eudcns dceuns cdeuns decuns edcuns ceduns ecduns ucedns cuedns uecdns eucdns ceudns ecudns dnceus ndceus dcneus cdneus ncdeus cndeus dnecus ndecus dencus edncus nedcus endcus dcenus cdenus decnus edcnus cednus ecdnus ncedus cnedus necdus encdus cendus ecndus unceds nuceds ucneds cuneds ncueds cnueds unecds nuecds uencds euncds neucds enucds ucends cuends uecnds eucnds ceunds ecunds nceuds cneuds necuds encuds cenuds ecnuds duncse udncse dnucse nducse undcse nudcse ducnse udcnse dcunse cdunse ucdnse cudnse dncuse ndcuse dcnuse cdnuse ncduse cnduse uncdse nucdse ucndse cundse ncudse cnudse dunsce udnsce dnusce ndusce undsce nudsce dusnce udsnce dsunce sdunce usdnce sudnce dnsuce ndsuce dsnuce sdnuce nsduce snduce unsdce nusdce usndce sundce nsudce snudce ducsne udcsne dcusne cdusne ucdsne cudsne duscne udscne dsucne sducne usdcne sudcne dcsune cdsune dscune sdcune csdune scdune ucsdne cusdne uscdne sucdne csudne scudne dncsue ndcsue dcnsue cdnsue ncdsue cndsue dnscue ndscue dsncue sdncue nsdcue sndcue dcsnue cdsnue dscnue sdcnue csdnue scdnue ncsdue cnsdue nscdue sncdue csndue scndue uncsde nucsde ucnsde cunsde ncusde cnusde unscde nuscde usncde suncde nsucde snucde ucsnde cusnde uscnde sucnde csunde scunde ncsude cnsude nscude sncude csnude scnude dunesc udnesc dnuesc nduesc undesc nudesc duensc udensc deunsc edunsc uednsc eudnsc dneusc ndeusc denusc ednusc nedusc endusc unedsc nuedsc uendsc eundsc neudsc enudsc dunsec udnsec dnusec ndusec undsec nudsec dusnec udsnec dsunec sdunec usdnec sudnec dnsuec ndsuec dsnuec sdnuec nsduec snduec unsdec nusdec usndec sundec nsudec snudec duesnc udesnc deusnc edusnc uedsnc eudsnc dusenc udsenc dsuenc sduenc usdenc sudenc desunc edsunc dseunc sdeunc esdunc sedunc uesdnc eusdnc usednc suednc esudnc seudnc dnesuc ndesuc densuc ednsuc nedsuc endsuc dnseuc ndseuc dsneuc sdneuc nsdeuc sndeuc desnuc edsnuc dsenuc sdenuc esdnuc sednuc nesduc ensduc nseduc sneduc esnduc senduc unesdc nuesdc uensdc eunsdc neusdc enusdc unsedc nusedc usnedc sunedc nsuedc snuedc uesndc eusndc usendc suendc esundc seundc nesudc ensudc nseudc sneudc esnudc senudc ducesn udcesn dcuesn cduesn ucdesn cudesn duecsn udecsn deucsn educsn uedcsn eudcsn dceusn cdeusn decusn edcusn cedusn ecdusn ucedsn cuedsn uecdsn eucdsn ceudsn ecudsn ducsen udcsen dcusen cdusen ucdsen cudsen duscen udscen dsucen sducen usdcen sudcen dcsuen cdsuen dscuen sdcuen csduen scduen ucsden cusden uscden sucden csuden scuden duescn udescn deuscn eduscn uedscn eudscn dusecn udsecn dsuecn sduecn usdecn sudecn desucn edsucn dseucn sdeucn esducn seducn uesdcn eusdcn usedcn suedcn esudcn seudcn dcesun cdesun decsun edcsun cedsun ecdsun dcseun cdseun dsceun sdceun csdeun scdeun descun edscun dsecun sdecun esdcun sedcun cesdun ecsdun csedun scedun escdun secdun ucesdn cuesdn uecsdn eucsdn ceusdn ecusdn ucsedn cusedn uscedn sucedn csuedn scuedn uescdn euscdn usecdn suecdn esucdn seucdn cesudn ecsudn cseudn sceudn escudn secudn dncesu ndcesu dcnesu cdnesu ncdesu cndesu dnecsu ndecsu dencsu edncsu nedcsu endcsu dcensu cdensu decnsu edcnsu cednsu ecdnsu ncedsu cnedsu necdsu encdsu cendsu ecndsu dncseu ndcseu dcnseu cdnseu ncdseu cndseu dnsceu ndsceu dsnceu sdnceu nsdceu sndceu dcsneu cdsneu dscneu sdcneu csdneu scdneu ncsdeu cnsdeu nscdeu sncdeu csndeu scndeu dnescu ndescu denscu ednscu nedscu endscu dnsecu ndsecu dsnecu sdnecu nsdecu sndecu desncu edsncu dsencu sdencu esdncu sedncu nesdcu ensdcu nsedcu snedcu esndcu sendcu dcesnu cdesnu decsnu edcsnu cedsnu ecdsnu dcsenu cdsenu dscenu sdcenu csdenu scdenu descnu edscnu dsecnu sdecnu esdcnu sedcnu cesdnu ecsdnu csednu scednu escdnu secdnu ncesdu cnesdu necsdu encsdu censdu ecnsdu ncsedu cnsedu nscedu sncedu csnedu scnedu nescdu enscdu nsecdu snecdu esncdu sencdu cesndu ecsndu csendu scendu escndu secndu uncesd nucesd ucnesd cunesd ncuesd cnuesd unecsd nuecsd uencsd euncsd neucsd enucsd ucensd cuensd uecnsd eucnsd ceunsd ecunsd nceusd cneusd necusd encusd cenusd ecnusd uncsed nucsed ucnsed cunsed ncused cnused unsced nusced usnced sunced nsuced snuced ucsned cusned uscned sucned csuned scuned ncsued cnsued nscued sncued csnued scnued unescd nuescd uenscd eunscd neuscd enuscd unsecd nusecd usnecd sunecd nsuecd snuecd uesncd eusncd usencd suencd esuncd seuncd nesucd ensucd nseucd sneucd esnucd senucd ucesnd cuesnd uecsnd eucsnd ceusnd ecusnd ucsend cusend uscend sucend csuend scuend uescnd euscnd usecnd suecnd esucnd seucnd cesund ecsund cseund sceund escund secund ncesud cnesud necsud encsud censud ecnsud ncseud cnseud nsceud snceud csneud scneud nescud enscud nsecud snecud esncud sencud cesnud ecsnud csenud scenud escnud secnud
Note: these 'words' (valid or invalid) are all the permutations of the word dunces. These words are obtained by scrambling the letters in dunces.