oldest lodest odlest dolest ldoest dloest oledst loedst oeldst eoldst leodst elodst odelst doelst oedlst eodlst deolst edolst ldeost dleost ledost eldost delost edlost oldset lodset odlset dolset ldoset dloset olsdet losdet osldet soldet lsodet slodet odslet doslet osdlet sodlet dsolet sdolet ldsoet dlsoet lsdoet sldoet dsloet sdloet olesdt loesdt oelsdt eolsdt leosdt elosdt olsedt losedt osledt soledt lsoedt sloedt oesldt eosldt oseldt soeldt esoldt seoldt lesodt elsodt lseodt sleodt eslodt selodt odeslt doeslt oedslt eodslt deoslt edoslt odselt doselt osdelt sodelt dsoelt sdoelt oesdlt eosdlt osedlt soedlt esodlt seodlt desolt edsolt dseolt sdeolt esdolt sedolt ldesot dlesot ledsot eldsot delsot edlsot ldseot dlseot lsdeot sldeot dsleot sdleot lesdot elsdot lsedot sledot esldot seldot deslot edslot dselot sdelot esdlot sedlot oldets lodets odlets dolets ldoets dloets oledts loedts oeldts eoldts leodts elodts odelts doelts oedlts eodlts deolts edolts ldeots dleots ledots eldots delots edlots oldtes lodtes odltes doltes ldotes dlotes oltdes lotdes otldes toldes ltodes tlodes odtles dotles otdles todles dtoles tdoles ldtoes dltoes ltdoes tldoes dtloes tdloes oletds loetds oeltds eoltds leotds elotds olteds loteds otleds toleds ltoeds tloeds oetlds eotlds otelds toelds etolds teolds letods eltods lteods tleods etlods telods odetls doetls oedtls eodtls deotls edotls odtels dotels otdels todels dtoels tdoels oetdls eotdls otedls toedls etodls teodls detols edtols dteols tdeols etdols tedols ldetos dletos ledtos eldtos deltos edltos ldteos dlteos ltdeos tldeos dtleos tdleos letdos eltdos ltedos tledos etldos teldos detlos edtlos dtelos tdelos etdlos tedlos oldste lodste odlste dolste ldoste dloste olsdte losdte osldte soldte lsodte slodte odslte doslte osdlte sodlte dsolte sdolte ldsote dlsote lsdote sldote dslote sdlote oldtse lodtse odltse doltse ldotse dlotse oltdse lotdse otldse toldse ltodse tlodse odtlse dotlse otdlse todlse dtolse tdolse ldtose dltose ltdose tldose dtlose tdlose olstde lostde osltde soltde lsotde slotde oltsde lotsde otlsde tolsde ltosde tlosde ostlde sotlde otslde toslde stolde tsolde lstode sltode ltsode tlsode stlode tslode odstle dostle osdtle sodtle dsotle sdotle odtsle dotsle otdsle todsle dtosle tdosle ostdle sotdle otsdle tosdle stodle tsodle dstole sdtole dtsole tdsole stdole tsdole ldstoe dlstoe lsdtoe sldtoe dsltoe sdltoe ldtsoe dltsoe ltdsoe tldsoe dtlsoe tdlsoe lstdoe sltdoe ltsdoe tlsdoe stldoe tsldoe dstloe sdtloe dtsloe tdsloe stdloe tsdloe olestd loestd oelstd eolstd leostd elostd olsetd losetd osletd soletd lsoetd sloetd oesltd eosltd oseltd soeltd esoltd seoltd lesotd elsotd lseotd sleotd eslotd selotd oletsd loetsd oeltsd eoltsd leotsd elotsd oltesd lotesd otlesd tolesd ltoesd tloesd oetlsd eotlsd otelsd toelsd etolsd teolsd letosd eltosd lteosd tleosd etlosd telosd olsted losted oslted solted lsoted sloted oltsed lotsed otlsed tolsed ltosed tlosed ostled sotled otsled tosled stoled tsoled lstoed sltoed ltsoed tlsoed stloed tsloed oestld eostld osetld soetld esotld seotld oetsld eotsld otesld toesld etosld teosld osteld soteld otseld toseld stoeld tsoeld estold setold etsold tesold steold tseold lestod elstod lsetod sletod esltod seltod letsod eltsod ltesod tlesod etlsod telsod lsteod slteod ltseod tlseod stleod tsleod estlod setlod etslod teslod stelod tselod odestl doestl oedstl eodstl deostl edostl odsetl dosetl osdetl sodetl dsoetl sdoetl oesdtl eosdtl osedtl soedtl esodtl seodtl desotl edsotl dseotl sdeotl esdotl sedotl odetsl doetsl oedtsl eodtsl deotsl edotsl odtesl dotesl otdesl todesl dtoesl tdoesl oetdsl eotdsl otedsl toedsl etodsl teodsl detosl edtosl dteosl tdeosl etdosl tedosl odstel dostel osdtel sodtel dsotel sdotel odtsel dotsel otdsel todsel dtosel tdosel ostdel sotdel otsdel tosdel stodel tsodel dstoel sdtoel dtsoel tdsoel stdoel tsdoel oestdl eostdl osetdl soetdl esotdl seotdl oetsdl eotsdl otesdl toesdl etosdl teosdl ostedl sotedl otsedl tosedl stoedl tsoedl estodl setodl etsodl tesodl steodl tseodl destol edstol dsetol sdetol esdtol sedtol detsol edtsol dtesol tdesol etdsol tedsol dsteol sdteol dtseol tdseol stdeol tsdeol estdol setdol etsdol tesdol stedol tsedol ldesto dlesto ledsto eldsto delsto edlsto ldseto dlseto lsdeto sldeto dsleto sdleto lesdto elsdto lsedto sledto esldto seldto deslto edslto dselto sdelto esdlto sedlto ldetso dletso ledtso eldtso deltso edltso ldteso dlteso ltdeso tldeso dtleso tdleso letdso eltdso ltedso tledso etldso teldso detlso edtlso dtelso tdelso etdlso tedlso ldsteo dlsteo lsdteo sldteo dslteo sdlteo ldtseo dltseo ltdseo tldseo dtlseo tdlseo lstdeo sltdeo ltsdeo tlsdeo stldeo tsldeo dstleo sdtleo dtsleo tdsleo stdleo tsdleo lestdo elstdo lsetdo sletdo esltdo seltdo letsdo eltsdo ltesdo tlesdo etlsdo telsdo lstedo sltedo ltsedo tlsedo stledo tsledo estldo setldo etsldo tesldo steldo tseldo destlo edstlo dsetlo sdetlo esdtlo sedtlo detslo edtslo dteslo tdeslo etdslo tedslo dstelo sdtelo dtselo tdselo stdelo tsdelo estdlo setdlo etsdlo tesdlo stedlo tsedlo
Note: these 'words' (valid or invalid) are all the permutations of the word oldest. These words are obtained by scrambling the letters in oldest.