undoer nudoer udnoer dunoer nduoer dnuoer unoder nuoder uonder ounder nouder onuder udoner duoner uodner oudner douner oduner ndouer dnouer noduer onduer donuer odnuer undeor nudeor udneor duneor ndueor dnueor unedor nuedor uendor eundor neudor enudor udenor duenor uednor eudnor deunor edunor ndeuor dneuor neduor enduor denuor ednuor unoedr nuoedr uonedr ounedr nouedr onuedr uneodr nueodr uenodr eunodr neuodr enuodr uoendr ouendr ueondr euondr oeundr eoundr noeudr oneudr neoudr enoudr oenudr eonudr udoenr duoenr uodenr oudenr douenr oduenr udeonr dueonr uedonr eudonr deuonr eduonr uoednr ouednr ueodnr euodnr oeudnr eoudnr doeunr odeunr deounr edounr oedunr eodunr ndoeur dnoeur nodeur ondeur doneur odneur ndeour dneour nedour endour denour ednour noedur onedur neodur enodur oendur eondur doenur odenur deonur edonur oednur eodnur undore nudore udnore dunore nduore dnuore unodre nuodre uondre oundre noudre onudre udonre duonre uodnre oudnre dounre odunre ndoure dnoure nodure ondure donure odnure undroe nudroe udnroe dunroe nduroe dnuroe unrdoe nurdoe urndoe rundoe nrudoe rnudoe udrnoe durnoe urdnoe rudnoe drunoe rdunoe ndruoe dnruoe nrduoe rnduoe drnuoe rdnuoe unorde nuorde uonrde ounrde nourde onurde unrode nurode urnode runode nruode rnuode uornde ournde uronde ruonde orunde rounde norude onrude nroude rnoude ornude ronude udorne duorne uodrne oudrne dourne odurne udrone durone urdone rudone druone rduone uordne ourdne urodne ruodne orudne roudne dorune odrune droune rdoune ordune rodune ndorue dnorue nodrue ondrue donrue odnrue ndroue dnroue nrdoue rndoue drnoue rdnoue nordue onrdue nrodue rnodue orndue rondue dornue odrnue dronue rdonue ordnue rodnue undero nudero udnero dunero nduero dnuero unedro nuedro uendro eundro neudro enudro udenro duenro uednro eudnro deunro edunro ndeuro dneuro neduro enduro denuro ednuro undreo nudreo udnreo dunreo ndureo dnureo unrdeo nurdeo urndeo rundeo nrudeo rnudeo udrneo durneo urdneo rudneo druneo rduneo ndrueo dnrueo nrdueo rndueo drnueo rdnueo unerdo nuerdo uenrdo eunrdo neurdo enurdo unredo nuredo urnedo runedo nruedo rnuedo uerndo eurndo urendo ruendo erundo reundo nerudo enrudo nreudo rneudo ernudo renudo uderno duerno uedrno eudrno deurno edurno udreno dureno urdeno rudeno drueno rdueno uerdno eurdno uredno ruedno erudno reudno deruno edruno dreuno rdeuno erduno reduno nderuo dneruo nedruo endruo denruo ednruo ndreuo dnreuo nrdeuo rndeuo drneuo rdneuo nerduo enrduo nreduo rneduo ernduo renduo dernuo edrnuo drenuo rdenuo erdnuo rednuo unoerd nuoerd uonerd ounerd nouerd onuerd uneord nueord uenord eunord neuord enuord uoenrd ouenrd ueonrd euonrd oeunrd eounrd noeurd oneurd neourd enourd oenurd eonurd unored nuored uonred ounred noured onured unroed nuroed urnoed runoed nruoed rnuoed uorned ourned uroned ruoned oruned rouned norued onrued nroued rnoued ornued ronued unerod nuerod uenrod eunrod neurod enurod unreod nureod urneod runeod nrueod rnueod uernod eurnod urenod ruenod erunod reunod neruod enruod nreuod rneuod ernuod renuod uoernd ouernd ueornd euornd oeurnd eournd uorend ourend uroend ruoend oruend rouend uerond eurond ureond rueond eruond reuond oerund eorund oreund roeund eround reound noerud onerud neorud enorud oenrud eonrud noreud onreud nroeud rnoeud orneud roneud neroud enroud nreoud rneoud ernoud renoud oernud eornud orenud roenud eronud reonud udoern duoern uodern oudern douern oduern udeorn dueorn uedorn eudorn deuorn eduorn uoedrn ouedrn ueodrn euodrn oeudrn eoudrn doeurn odeurn deourn edourn oedurn eodurn udoren duoren uodren oudren douren oduren udroen duroen urdoen rudoen druoen rduoen uorden ourden uroden ruoden oruden rouden doruen odruen drouen rdouen orduen roduen uderon dueron uedron eudron deuron eduron udreon dureon urdeon rudeon drueon rdueon uerdon eurdon uredon ruedon erudon reudon deruon edruon dreuon rdeuon erduon reduon uoerdn ouerdn ueordn euordn oeurdn eourdn uoredn ouredn uroedn ruoedn oruedn rouedn uerodn eurodn ureodn rueodn eruodn reuodn oerudn eorudn oreudn roeudn eroudn reoudn doerun oderun deorun edorun oedrun eodrun doreun odreun droeun rdoeun ordeun rodeun deroun edroun dreoun rdeoun erdoun redoun oerdun eordun oredun roedun erodun reodun ndoeru dnoeru noderu onderu doneru odneru ndeoru dneoru nedoru endoru denoru ednoru noedru onedru neodru enodru oendru eondru doenru odenru deonru edonru oednru eodnru ndoreu dnoreu nodreu ondreu donreu odnreu ndroeu dnroeu nrdoeu rndoeu drnoeu rdnoeu nordeu onrdeu nrodeu rnodeu orndeu rondeu dorneu odrneu droneu rdoneu ordneu rodneu nderou dnerou nedrou endrou denrou ednrou ndreou dnreou nrdeou rndeou drneou rdneou nerdou enrdou nredou rnedou erndou rendou dernou edrnou drenou rdenou erdnou rednou noerdu onerdu neordu enordu oenrdu eonrdu noredu onredu nroedu rnoedu ornedu ronedu nerodu enrodu nreodu rneodu ernodu renodu oerndu eorndu orendu roendu erondu reondu doernu odernu deornu edornu oedrnu eodrnu dorenu odrenu droenu rdoenu ordenu rodenu deronu edronu dreonu rdeonu erdonu redonu oerdnu eordnu orednu roednu erodnu reodnu
Note: these 'words' (valid or invalid) are all the permutations of the word undoer. These words are obtained by scrambling the letters in undoer.