hydras yhdras hdyras dhyras ydhras dyhras hyrdas yhrdas hrydas rhydas yrhdas ryhdas hdryas dhryas hrdyas rhdyas drhyas rdhyas ydrhas dyrhas yrdhas rydhas dryhas rdyhas hydars yhdars hdyars dhyars ydhars dyhars hyadrs yhadrs haydrs ahydrs yahdrs ayhdrs hdayrs dhayrs hadyrs ahdyrs dahyrs adhyrs ydahrs dyahrs yadhrs aydhrs dayhrs adyhrs hyrads yhrads hryads rhyads yrhads ryhads hyards yhards hayrds ahyrds yahrds ayhrds hrayds rhayds haryds ahryds rahyds arhyds yrahds ryahds yarhds ayrhds rayhds aryhds hdrays dhrays hrdays rhdays drhays rdhays hdarys dharys hadrys ahdrys dahrys adhrys hradys rhadys hardys ahrdys rahdys arhdys drahys rdahys darhys adrhys radhys ardhys ydrahs dyrahs yrdahs rydahs dryahs rdyahs ydarhs dyarhs yadrhs aydrhs dayrhs adyrhs yradhs ryadhs yardhs ayrdhs raydhs arydhs drayhs rdayhs daryhs adryhs radyhs ardyhs hydrsa yhdrsa hdyrsa dhyrsa ydhrsa dyhrsa hyrdsa yhrdsa hrydsa rhydsa yrhdsa ryhdsa hdrysa dhrysa hrdysa rhdysa drhysa rdhysa ydrhsa dyrhsa yrdhsa rydhsa dryhsa rdyhsa hydsra yhdsra hdysra dhysra ydhsra dyhsra hysdra yhsdra hsydra shydra yshdra syhdra hdsyra dhsyra hsdyra shdyra dshyra sdhyra ydshra dyshra ysdhra sydhra dsyhra sdyhra hyrsda yhrsda hrysda rhysda yrhsda ryhsda hysrda yhsrda hsyrda shyrda yshrda syhrda hrsyda rhsyda hsryda shryda rshyda srhyda yrshda ryshda ysrhda syrhda rsyhda sryhda hdrsya dhrsya hrdsya rhdsya drhsya rdhsya hdsrya dhsrya hsdrya shdrya dshrya sdhrya hrsdya rhsdya hsrdya shrdya rshdya srhdya drshya rdshya dsrhya sdrhya rsdhya srdhya ydrsha dyrsha yrdsha rydsha drysha rdysha ydsrha dysrha ysdrha sydrha dsyrha sdyrha yrsdha rysdha ysrdha syrdha rsydha srydha drsyha rdsyha dsryha sdryha rsdyha srdyha hydasr yhdasr hdyasr dhyasr ydhasr dyhasr hyadsr yhadsr haydsr ahydsr yahdsr ayhdsr hdaysr dhaysr hadysr ahdysr dahysr adhysr ydahsr dyahsr yadhsr aydhsr dayhsr adyhsr hydsar yhdsar hdysar dhysar ydhsar dyhsar hysdar yhsdar hsydar shydar yshdar syhdar hdsyar dhsyar hsdyar shdyar dshyar sdhyar ydshar dyshar ysdhar sydhar dsyhar sdyhar hyasdr yhasdr haysdr ahysdr yahsdr ayhsdr hysadr yhsadr hsyadr shyadr yshadr syhadr hasydr ahsydr hsaydr shaydr ashydr sahydr yashdr ayshdr ysahdr syahdr asyhdr sayhdr hdasyr dhasyr hadsyr ahdsyr dahsyr adhsyr hdsayr dhsayr hsdayr shdayr dshayr sdhayr hasdyr ahsdyr hsadyr shadyr ashdyr sahdyr dashyr adshyr dsahyr sdahyr asdhyr sadhyr ydashr dyashr yadshr aydshr dayshr adyshr ydsahr dysahr ysdahr sydahr dsyahr sdyahr yasdhr aysdhr ysadhr syadhr asydhr saydhr dasyhr adsyhr dsayhr sdayhr asdyhr sadyhr hyrasd yhrasd hryasd rhyasd yrhasd ryhasd hyarsd yharsd hayrsd ahyrsd yahrsd ayhrsd hraysd rhaysd harysd ahrysd rahysd arhysd yrahsd ryahsd yarhsd ayrhsd rayhsd aryhsd hyrsad yhrsad hrysad rhysad yrhsad ryhsad hysrad yhsrad hsyrad shyrad yshrad syhrad hrsyad rhsyad hsryad shryad rshyad srhyad yrshad ryshad ysrhad syrhad rsyhad sryhad hyasrd yhasrd haysrd ahysrd yahsrd ayhsrd hysard yhsard hsyard shyard yshard syhard hasyrd ahsyrd hsayrd shayrd ashyrd sahyrd yashrd ayshrd ysahrd syahrd asyhrd sayhrd hrasyd rhasyd harsyd ahrsyd rahsyd arhsyd hrsayd rhsayd hsrayd shrayd rshayd srhayd hasryd ahsryd hsaryd sharyd ashryd sahryd rashyd arshyd rsahyd srahyd asrhyd sarhyd yrashd ryashd yarshd ayrshd rayshd aryshd yrsahd rysahd ysrahd syrahd rsyahd sryahd yasrhd aysrhd ysarhd syarhd asyrhd sayrhd rasyhd arsyhd rsayhd srayhd asryhd saryhd hdrasy dhrasy hrdasy rhdasy drhasy rdhasy hdarsy dharsy hadrsy ahdrsy dahrsy adhrsy hradsy rhadsy hardsy ahrdsy rahdsy arhdsy drahsy rdahsy darhsy adrhsy radhsy ardhsy hdrsay dhrsay hrdsay rhdsay drhsay rdhsay hdsray dhsray hsdray shdray dshray sdhray hrsday rhsday hsrday shrday rshday srhday drshay rdshay dsrhay sdrhay rsdhay srdhay hdasry dhasry hadsry ahdsry dahsry adhsry hdsary dhsary hsdary shdary dshary sdhary hasdry ahsdry hsadry shadry ashdry sahdry dashry adshry dsahry sdahry asdhry sadhry hrasdy rhasdy harsdy ahrsdy rahsdy arhsdy hrsady rhsady hsrady shrady rshady srhady hasrdy ahsrdy hsardy shardy ashrdy sahrdy rashdy arshdy rsahdy srahdy asrhdy sarhdy drashy rdashy darshy adrshy radshy ardshy drsahy rdsahy dsrahy sdrahy rsdahy srdahy dasrhy adsrhy dsarhy sdarhy asdrhy sadrhy rasdhy arsdhy rsadhy sradhy asrdhy sardhy ydrash dyrash yrdash rydash dryash rdyash ydarsh dyarsh yadrsh aydrsh dayrsh adyrsh yradsh ryadsh yardsh ayrdsh raydsh arydsh draysh rdaysh darysh adrysh radysh ardysh ydrsah dyrsah yrdsah rydsah drysah rdysah ydsrah dysrah ysdrah sydrah dsyrah sdyrah yrsdah rysdah ysrdah syrdah rsydah srydah drsyah rdsyah dsryah sdryah rsdyah srdyah ydasrh dyasrh yadsrh aydsrh daysrh adysrh ydsarh dysarh ysdarh sydarh dsyarh sdyarh yasdrh aysdrh ysadrh syadrh asydrh saydrh dasyrh adsyrh dsayrh sdayrh asdyrh sadyrh yrasdh ryasdh yarsdh ayrsdh raysdh arysdh yrsadh rysadh ysradh syradh rsyadh sryadh yasrdh aysrdh ysardh syardh asyrdh sayrdh rasydh arsydh rsaydh sraydh asrydh sarydh drasyh rdasyh darsyh adrsyh radsyh ardsyh drsayh rdsayh dsrayh sdrayh rsdayh srdayh dasryh adsryh dsaryh sdaryh asdryh sadryh rasdyh arsdyh rsadyh sradyh asrdyh sardyh
Note: these 'words' (valid or invalid) are all the permutations of the word hydras. These words are obtained by scrambling the letters in hydras.