hydrae yhdrae hdyrae dhyrae ydhrae dyhrae hyrdae yhrdae hrydae rhydae yrhdae ryhdae hdryae dhryae hrdyae rhdyae drhyae rdhyae ydrhae dyrhae yrdhae rydhae dryhae rdyhae hydare yhdare hdyare dhyare ydhare dyhare hyadre yhadre haydre ahydre yahdre ayhdre hdayre dhayre hadyre ahdyre dahyre adhyre ydahre dyahre yadhre aydhre dayhre adyhre hyrade yhrade hryade rhyade yrhade ryhade hyarde yharde hayrde ahyrde yahrde ayhrde hrayde rhayde haryde ahryde rahyde arhyde yrahde ryahde yarhde ayrhde rayhde aryhde hdraye dhraye hrdaye rhdaye drhaye rdhaye hdarye dharye hadrye ahdrye dahrye adhrye hradye rhadye hardye ahrdye rahdye arhdye drahye rdahye darhye adrhye radhye ardhye ydrahe dyrahe yrdahe rydahe dryahe rdyahe ydarhe dyarhe yadrhe aydrhe dayrhe adyrhe yradhe ryadhe yardhe ayrdhe raydhe arydhe drayhe rdayhe daryhe adryhe radyhe ardyhe hydrea yhdrea hdyrea dhyrea ydhrea dyhrea hyrdea yhrdea hrydea rhydea yrhdea ryhdea hdryea dhryea hrdyea rhdyea drhyea rdhyea ydrhea dyrhea yrdhea rydhea dryhea rdyhea hydera yhdera hdyera dhyera ydhera dyhera hyedra yhedra heydra ehydra yehdra eyhdra hdeyra dheyra hedyra ehdyra dehyra edhyra ydehra dyehra yedhra eydhra deyhra edyhra hyreda yhreda hryeda rhyeda yrheda ryheda hyerda yherda heyrda ehyrda yehrda eyhrda hreyda rheyda heryda ehryda rehyda erhyda yrehda ryehda yerhda eyrhda reyhda eryhda hdreya dhreya hrdeya rhdeya drheya rdheya hderya dherya hedrya ehdrya dehrya edhrya hredya rhedya herdya ehrdya rehdya erhdya drehya rdehya derhya edrhya redhya erdhya ydreha dyreha yrdeha rydeha dryeha rdyeha yderha dyerha yedrha eydrha deyrha edyrha yredha ryedha yerdha eyrdha reydha erydha dreyha rdeyha deryha edryha redyha erdyha hydaer yhdaer hdyaer dhyaer ydhaer dyhaer hyader yhader hayder ahyder yahder ayhder hdayer dhayer hadyer ahdyer dahyer adhyer ydaher dyaher yadher aydher dayher adyher hydear yhdear hdyear dhyear ydhear dyhear hyedar yhedar heydar ehydar yehdar eyhdar hdeyar dheyar hedyar ehdyar dehyar edhyar ydehar dyehar yedhar eydhar deyhar edyhar hyaedr yhaedr hayedr ahyedr yahedr ayhedr hyeadr yheadr heyadr ehyadr yehadr eyhadr haeydr aheydr heaydr ehaydr aehydr eahydr yaehdr ayehdr yeahdr eyahdr aeyhdr eayhdr hdaeyr dhaeyr hadeyr ahdeyr daheyr adheyr hdeayr dheayr hedayr ehdayr dehayr edhayr haedyr ahedyr headyr ehadyr aehdyr eahdyr daehyr adehyr deahyr edahyr aedhyr eadhyr ydaehr dyaehr yadehr aydehr dayehr adyehr ydeahr dyeahr yedahr eydahr deyahr edyahr yaedhr ayedhr yeadhr eyadhr aeydhr eaydhr daeyhr adeyhr deayhr edayhr aedyhr eadyhr hyraed yhraed hryaed rhyaed yrhaed ryhaed hyared yhared hayred ahyred yahred ayhred hrayed rhayed haryed ahryed rahyed arhyed yrahed ryahed yarhed ayrhed rayhed aryhed hyread yhread hryead rhyead yrhead ryhead hyerad yherad heyrad ehyrad yehrad eyhrad hreyad rheyad heryad ehryad rehyad erhyad yrehad ryehad yerhad eyrhad reyhad eryhad hyaerd yhaerd hayerd ahyerd yaherd ayherd hyeard yheard heyard ehyard yehard eyhard haeyrd aheyrd heayrd ehayrd aehyrd eahyrd yaehrd ayehrd yeahrd eyahrd aeyhrd eayhrd hraeyd rhaeyd hareyd ahreyd raheyd arheyd hreayd rheayd herayd ehrayd rehayd erhayd haeryd aheryd hearyd eharyd aehryd eahryd raehyd arehyd reahyd erahyd aerhyd earhyd yraehd ryaehd yarehd ayrehd rayehd aryehd yreahd ryeahd yerahd eyrahd reyahd eryahd yaerhd ayerhd yearhd eyarhd aeyrhd eayrhd raeyhd areyhd reayhd erayhd aeryhd earyhd hdraey dhraey hrdaey rhdaey drhaey rdhaey hdarey dharey hadrey ahdrey dahrey adhrey hradey rhadey hardey ahrdey rahdey arhdey drahey rdahey darhey adrhey radhey ardhey hdreay dhreay hrdeay rhdeay drheay rdheay hderay dheray hedray ehdray dehray edhray hreday rheday herday ehrday rehday erhday drehay rdehay derhay edrhay redhay erdhay hdaery dhaery hadery ahdery dahery adhery hdeary dheary hedary ehdary dehary edhary haedry ahedry headry ehadry aehdry eahdry daehry adehry deahry edahry aedhry eadhry hraedy rhaedy haredy ahredy rahedy arhedy hready rheady herady ehrady rehady erhady haerdy aherdy heardy ehardy aehrdy eahrdy raehdy arehdy reahdy erahdy aerhdy earhdy draehy rdaehy darehy adrehy radehy ardehy dreahy rdeahy derahy edrahy redahy erdahy daerhy aderhy dearhy edarhy aedrhy eadrhy raedhy aredhy readhy eradhy aerdhy eardhy ydraeh dyraeh yrdaeh rydaeh dryaeh rdyaeh ydareh dyareh yadreh aydreh dayreh adyreh yradeh ryadeh yardeh ayrdeh raydeh arydeh drayeh rdayeh daryeh adryeh radyeh ardyeh ydreah dyreah yrdeah rydeah dryeah rdyeah yderah dyerah yedrah eydrah deyrah edyrah yredah ryedah yerdah eyrdah reydah erydah dreyah rdeyah deryah edryah redyah erdyah ydaerh dyaerh yaderh ayderh dayerh adyerh ydearh dyearh yedarh eydarh deyarh edyarh yaedrh ayedrh yeadrh eyadrh aeydrh eaydrh daeyrh adeyrh deayrh edayrh aedyrh eadyrh yraedh ryaedh yaredh ayredh rayedh aryedh yreadh ryeadh yeradh eyradh reyadh eryadh yaerdh ayerdh yeardh eyardh aeyrdh eayrdh raeydh areydh reaydh eraydh aerydh earydh draeyh rdaeyh dareyh adreyh radeyh ardeyh dreayh rdeayh derayh edrayh redayh erdayh daeryh aderyh dearyh edaryh aedryh eadryh raedyh aredyh readyh eradyh aerdyh eardyh
Note: these 'words' (valid or invalid) are all the permutations of the word hydrae. These words are obtained by scrambling the letters in hydrae.