treads rteads terads etrads retads ertads traeds rtaeds tareds atreds rateds arteds teards etards taerds aterds eatrds aetrds reatds eratds raetds aretds eartds aertds tredas rtedas terdas etrdas retdas ertdas trdeas rtdeas tdreas dtreas rdteas drteas tedras etdras tderas dteras edtras detras redtas erdtas rdetas dretas edrtas dertas trades rtades tardes atrdes ratdes artdes trdaes rtdaes tdraes dtraes rdtaes drtaes tadres atdres tdares dtares adtres datres radtes ardtes rdates drates adrtes dartes teadrs etadrs taedrs atedrs eatdrs aetdrs tedars etdars tdears dtears edtars detars taders atders tdaers dtaers adters daters eadtrs aedtrs edatrs deatrs adetrs daetrs readts eradts raedts aredts eardts aerdts redats erdats rdeats dreats edrats derats radets ardets rdaets draets adrets darets eadrts aedrts edarts dearts aderts daerts treasd rteasd terasd etrasd retasd ertasd traesd rtaesd taresd atresd ratesd artesd tearsd etarsd taersd atersd eatrsd aetrsd reatsd eratsd raetsd aretsd eartsd aertsd tresad rtesad tersad etrsad retsad ertsad trsead rtsead tsread stread rstead srtead tesrad etsrad tserad sterad estrad setrad restad erstad rsetad sretad esrtad sertad trased rtased tarsed atrsed ratsed artsed trsaed rtsaed tsraed straed rstaed srtaed tasred atsred tsared stared astred satred rasted arsted rsated srated asrted sarted teasrd etasrd taesrd atesrd eatsrd aetsrd tesard etsard tseard steard estard setard taserd atserd tsaerd staerd asterd saterd eastrd aestrd esatrd seatrd asetrd saetrd reastd erastd raestd arestd earstd aerstd resatd ersatd rseatd sreatd esratd seratd rasetd arsetd rsaetd sraetd asretd saretd easrtd aesrtd esartd seartd asertd saertd tredsa rtedsa terdsa etrdsa retdsa ertdsa trdesa rtdesa tdresa dtresa rdtesa drtesa tedrsa etdrsa tdersa dtersa edtrsa detrsa redtsa erdtsa rdetsa dretsa edrtsa dertsa tresda rtesda tersda etrsda retsda ertsda trseda rtseda tsreda streda rsteda srteda tesrda etsrda tserda sterda estrda setrda restda erstda rsetda sretda esrtda sertda trdsea rtdsea tdrsea dtrsea rdtsea drtsea trsdea rtsdea tsrdea strdea rstdea srtdea tdsrea dtsrea tsdrea stdrea dstrea sdtrea rdstea drstea rsdtea srdtea dsrtea sdrtea tedsra etdsra tdesra dtesra edtsra detsra tesdra etsdra tsedra stedra estdra setdra tdsera dtsera tsdera stdera dstera sdtera edstra destra esdtra sedtra dsetra sdetra redsta erdsta rdesta dresta edrsta dersta resdta ersdta rsedta sredta esrdta serdta rdseta drseta rsdeta srdeta dsreta sdreta edsrta desrta esdrta sedrta dserta sderta tradse rtadse tardse atrdse ratdse artdse trdase rtdase tdrase dtrase rdtase drtase tadrse atdrse tdarse dtarse adtrse datrse radtse ardtse rdatse dratse adrtse dartse trasde rtasde tarsde atrsde ratsde artsde trsade rtsade tsrade strade rstade srtade tasrde atsrde tsarde starde astrde satrde rastde arstde rsatde sratde asrtde sartde trdsae rtdsae tdrsae dtrsae rdtsae drtsae trsdae rtsdae tsrdae strdae rstdae srtdae tdsrae dtsrae tsdrae stdrae dstrae sdtrae rdstae drstae rsdtae srdtae dsrtae sdrtae tadsre atdsre tdasre dtasre adtsre datsre tasdre atsdre tsadre stadre astdre satdre tdsare dtsare tsdare stdare dstare sdtare adstre dastre asdtre sadtre dsatre sdatre radste ardste rdaste draste adrste darste rasdte arsdte rsadte sradte asrdte sardte rdsate drsate rsdate srdate dsrate sdrate adsrte dasrte asdrte sadrte dsarte sdarte teadsr etadsr taedsr atedsr eatdsr aetdsr tedasr etdasr tdeasr dteasr edtasr detasr tadesr atdesr tdaesr dtaesr adtesr datesr eadtsr aedtsr edatsr deatsr adetsr daetsr teasdr etasdr taesdr atesdr eatsdr aetsdr tesadr etsadr tseadr steadr estadr setadr tasedr atsedr tsaedr staedr astedr satedr eastdr aestdr esatdr seatdr asetdr saetdr tedsar etdsar tdesar dtesar edtsar detsar tesdar etsdar tsedar stedar estdar setdar tdsear dtsear tsdear stdear dstear sdtear edstar destar esdtar sedtar dsetar sdetar tadser atdser tdaser dtaser adtser datser tasder atsder tsader stader astder satder tdsaer dtsaer tsdaer stdaer dstaer sdtaer adster daster asdter sadter dsater sdater eadstr aedstr edastr deastr adestr daestr easdtr aesdtr esadtr seadtr asedtr saedtr edsatr desatr esdatr sedatr dseatr sdeatr adsetr dasetr asdetr sadetr dsaetr sdaetr readst eradst raedst aredst eardst aerdst redast erdast rdeast dreast edrast derast radest ardest rdaest draest adrest darest eadrst aedrst edarst dearst aderst daerst reasdt erasdt raesdt aresdt earsdt aersdt resadt ersadt rseadt sreadt esradt seradt rasedt arsedt rsaedt sraedt asredt saredt easrdt aesrdt esardt seardt aserdt saerdt redsat erdsat rdesat dresat edrsat dersat resdat ersdat rsedat sredat esrdat serdat rdseat drseat rsdeat srdeat dsreat sdreat edsrat desrat esdrat sedrat dserat sderat radset ardset rdaset draset adrset darset rasdet arsdet rsadet sradet asrdet sardet rdsaet drsaet rsdaet srdaet dsraet sdraet adsret dasret asdret sadret dsaret sdaret eadsrt aedsrt edasrt deasrt adesrt daesrt easdrt aesdrt esadrt seadrt asedrt saedrt edsart desart esdart sedart dseart sdeart adsert dasert asdert sadert dsaert sdaert
Note: these 'words' (valid or invalid) are all the permutations of the word treads. These words are obtained by scrambling the letters in treads.