regain ergain rgeain greain egrain gerain reagin eragin raegin aregin eargin aergin rgaein graein ragein argein garein agrein egarin gearin eagrin aegrin gaerin agerin regian ergian rgeian greian egrian gerian reigan erigan riegan iregan eirgan iergan rgiean griean rigean irgean girean igrean egiran geiran eigran iegran gieran igeran reaign eraign raeign areign earign aerign reiagn eriagn rieagn ireagn eiragn ieragn raiegn ariegn riaegn iraegn airegn iaregn eairgn aeirgn eiargn ieargn aiergn iaergn rgaien graien ragien argien garien agrien rgiaen griaen rigaen irgaen giraen igraen raigen arigen riagen iragen airgen iargen gairen agiren giaren igaren aigren iagren egairn geairn eagirn aegirn gaeirn ageirn egiarn geiarn eigarn iegarn giearn igearn eaigrn aeigrn eiagrn ieagrn aiegrn iaegrn gaiern agiern giaern igaern aigern iagern regani ergani rgeani greani egrani gerani reagni eragni raegni aregni eargni aergni rgaeni graeni rageni argeni gareni agreni egarni gearni eagrni aegrni gaerni agerni regnai ergnai rgenai grenai egrnai gernai rengai erngai rnegai nregai enrgai nergai rgneai grneai rngeai nrgeai gnreai ngreai egnrai genrai engrai negrai gnerai ngerai reangi erangi raengi arengi earngi aerngi renagi ernagi rneagi nreagi enragi neragi ranegi arnegi rnaegi nraegi anregi naregi eanrgi aenrgi enargi neargi anergi naergi rganei granei ragnei argnei garnei agrnei rgnaei grnaei rngaei nrgaei gnraei ngraei rangei arngei rnagei nragei anrgei nargei ganrei agnrei gnarei ngarei angrei nagrei eganri geanri eagnri aegnri gaenri agenri egnari genari engari negari gneari ngeari eangri aengri enagri neagri anegri naegri ganeri agneri gnaeri ngaeri angeri nageri regina ergina rgeina greina egrina gerina reigna erigna riegna iregna eirgna iergna rgiena griena rigena irgena girena igrena egirna geirna eigrna iegrna gierna igerna regnia ergnia rgenia grenia egrnia gernia rengia erngia rnegia nregia enrgia nergia rgneia grneia rngeia nrgeia gnreia ngreia egnria genria engria negria gneria ngeria reinga eringa rienga irenga eirnga iernga reniga erniga rneiga nreiga enriga neriga rinega irnega rniega nriega inrega nirega einrga ienrga enirga neirga inerga nierga rginea grinea rignea irgnea girnea igrnea rgniea grniea rngiea nrgiea gnriea ngriea ringea irngea rnigea nrigea inrgea nirgea ginrea ignrea gnirea ngirea ingrea nigrea eginra geinra eignra iegnra gienra igenra egnira genira engira negira gneira ngeira eingra iengra enigra neigra inegra niegra ginera ignera gniera ngiera ingera nigera reaing eraing raeing areing earing aering reiang eriang rieang ireang eirang ierang raieng arieng riaeng iraeng aireng iareng eairng aeirng eiarng iearng aierng iaerng reanig eranig raenig arenig earnig aernig renaig ernaig rneaig nreaig enraig neraig raneig arneig rnaeig nraeig anreig nareig eanrig aenrig enarig nearig anerig naerig reinag erinag rienag irenag eirnag iernag reniag erniag rneiag nreiag enriag neriag rineag irneag rnieag nrieag inreag nireag einrag ienrag enirag neirag inerag nierag raineg arineg rianeg iraneg airneg iarneg ranieg arnieg rnaieg nraieg anrieg narieg rinaeg irnaeg rniaeg nriaeg inraeg niraeg ainreg ianreg anireg naireg inareg niareg eainrg aeinrg eianrg ieanrg aienrg iaenrg eanirg aenirg enairg neairg aneirg naeirg einarg ienarg eniarg neiarg inearg niearg ainerg ianerg anierg naierg inaerg niaerg rgaine graine ragine argine garine agrine rgiane griane rigane irgane girane igrane raigne arigne riagne iragne airgne iargne gairne agirne giarne igarne aigrne iagrne rganie granie ragnie argnie garnie agrnie rgnaie grnaie rngaie nrgaie gnraie ngraie rangie arngie rnagie nragie anrgie nargie ganrie agnrie gnarie ngarie angrie nagrie rginae grinae rignae irgnae girnae igrnae rgniae grniae rngiae nrgiae gnriae ngriae ringae irngae rnigae nrigae inrgae nirgae ginrae ignrae gnirae ngirae ingrae nigrae rainge aringe riange irange airnge iarnge ranige arnige rnaige nraige anrige narige rinage irnage rniage nriage inrage nirage ainrge ianrge anirge nairge inarge niarge gainre aginre gianre iganre aignre iagnre ganire agnire gnaire ngaire angire nagire ginare ignare gniare ngiare ingare nigare aingre iangre anigre naigre inagre niagre egainr geainr eaginr aeginr gaeinr ageinr egianr geianr eiganr ieganr gieanr igeanr eaignr aeignr eiagnr ieagnr aiegnr iaegnr gaienr agienr giaenr igaenr aigenr iagenr eganir geanir eagnir aegnir gaenir agenir egnair genair engair negair gneair ngeair eangir aengir enagir neagir anegir naegir ganeir agneir gnaeir ngaeir angeir nageir eginar geinar eignar iegnar gienar igenar egniar geniar engiar negiar gneiar ngeiar eingar iengar enigar neigar inegar niegar ginear ignear gniear ngiear ingear nigear eaingr aeingr eiangr ieangr aiengr iaengr eanigr aenigr enaigr neaigr aneigr naeigr einagr ienagr eniagr neiagr ineagr nieagr ainegr ianegr aniegr naiegr inaegr niaegr gainer aginer gianer iganer aigner iagner ganier agnier gnaier ngaier angier nagier ginaer ignaer gniaer ngiaer ingaer nigaer ainger ianger aniger naiger inager niager
Note: these 'words' (valid or invalid) are all the permutations of the word regain. These words are obtained by scrambling the letters in regain.