trough rtough torugh otrugh rotugh ortugh truogh rtuogh turogh utrogh rutogh urtogh tourgh oturgh tuorgh utorgh outrgh uotrgh routgh orutgh ruotgh urotgh ourtgh uortgh troguh rtoguh torguh otrguh rotguh ortguh trgouh rtgouh tgrouh gtrouh rgtouh grtouh togruh otgruh tgoruh gtoruh ogtruh gotruh rogtuh orgtuh rgotuh grotuh ogrtuh gortuh trugoh rtugoh turgoh utrgoh rutgoh urtgoh trguoh rtguoh tgruoh gtruoh rgtuoh grtuoh tugroh utgroh tguroh gturoh ugtroh gutroh rugtoh urgtoh rgutoh grutoh ugrtoh gurtoh tougrh otugrh tuogrh utogrh outgrh uotgrh togurh otgurh tgourh gtourh ogturh goturh tugorh utgorh tguorh gtuorh ugtorh gutorh ougtrh uogtrh ogutrh goutrh ugotrh guotrh rougth orugth ruogth urogth ourgth uorgth roguth orguth rgouth grouth ogruth goruth rugoth urgoth rguoth gruoth ugroth guroth ougrth uogrth ogurth gourth ugorth guorth trouhg rtouhg toruhg otruhg rotuhg ortuhg truohg rtuohg turohg utrohg rutohg urtohg tourhg oturhg tuorhg utorhg outrhg uotrhg routhg oruthg ruothg urothg ourthg uorthg trohug rtohug torhug otrhug rothug orthug trhoug rthoug throug htroug rhtoug hrtoug tohrug othrug thorug htorug ohtrug hotrug rohtug orhtug rhotug hrotug ohrtug hortug truhog rtuhog turhog utrhog ruthog urthog trhuog rthuog thruog htruog rhtuog hrtuog tuhrog uthrog thurog hturog uhtrog hutrog ruhtog urhtog rhutog hrutog uhrtog hurtog touhrg otuhrg tuohrg utohrg outhrg uothrg tohurg othurg thourg htourg ohturg hoturg tuhorg uthorg thuorg htuorg uhtorg hutorg ouhtrg uohtrg ohutrg houtrg uhotrg huotrg rouhtg oruhtg ruohtg urohtg ourhtg uorhtg rohutg orhutg rhoutg hroutg ohrutg horutg ruhotg urhotg rhuotg hruotg uhrotg hurotg ouhrtg uohrtg ohurtg hourtg uhortg huortg troghu rtoghu torghu otrghu rotghu ortghu trgohu rtgohu tgrohu gtrohu rgtohu grtohu togrhu otgrhu tgorhu gtorhu ogtrhu gotrhu rogthu orgthu rgothu grothu ogrthu gorthu trohgu rtohgu torhgu otrhgu rothgu orthgu trhogu rthogu throgu htrogu rhtogu hrtogu tohrgu othrgu thorgu htorgu ohtrgu hotrgu rohtgu orhtgu rhotgu hrotgu ohrtgu hortgu trghou rtghou tgrhou gtrhou rgthou grthou trhgou rthgou thrgou htrgou rhtgou hrtgou tghrou gthrou thgrou htgrou ghtrou hgtrou rghtou grhtou rhgtou hrgtou ghrtou hgrtou toghru otghru tgohru gtohru ogthru gothru tohgru othgru thogru htogru ohtgru hotgru tghoru gthoru thgoru htgoru ghtoru hgtoru oghtru gohtru ohgtru hogtru ghotru hgotru roghtu orghtu rgohtu grohtu ogrhtu gorhtu rohgtu orhgtu rhogtu hrogtu ohrgtu horgtu rghotu grhotu rhgotu hrgotu ghrotu hgrotu oghrtu gohrtu ohgrtu hogrtu ghortu hgortu trugho rtugho turgho utrgho rutgho urtgho trguho rtguho tgruho gtruho rgtuho grtuho tugrho utgrho tgurho gturho ugtrho gutrho rugtho urgtho rgutho grutho ugrtho gurtho truhgo rtuhgo turhgo utrhgo ruthgo urthgo trhugo rthugo thrugo htrugo rhtugo hrtugo tuhrgo uthrgo thurgo hturgo uhtrgo hutrgo ruhtgo urhtgo rhutgo hrutgo uhrtgo hurtgo trghuo rtghuo tgrhuo gtrhuo rgthuo grthuo trhguo rthguo thrguo htrguo rhtguo hrtguo tghruo gthruo thgruo htgruo ghtruo hgtruo rghtuo grhtuo rhgtuo hrgtuo ghrtuo hgrtuo tughro utghro tguhro gtuhro ugthro guthro tuhgro uthgro thugro htugro uhtgro hutgro tghuro gthuro thguro htguro ghturo hgturo ughtro guhtro uhgtro hugtro ghutro hgutro rughto urghto rguhto gruhto ugrhto gurhto ruhgto urhgto rhugto hrugto uhrgto hurgto rghuto grhuto rhguto hrguto ghruto hgruto ughrto guhrto uhgrto hugrto ghurto hgurto toughr otughr tuoghr utoghr outghr uotghr toguhr otguhr tgouhr gtouhr ogtuhr gotuhr tugohr utgohr tguohr gtuohr ugtohr gutohr ougthr uogthr oguthr gouthr ugothr guothr touhgr otuhgr tuohgr utohgr outhgr uothgr tohugr othugr thougr htougr ohtugr hotugr tuhogr uthogr thuogr htuogr uhtogr hutogr ouhtgr uohtgr ohutgr houtgr uhotgr huotgr toghur otghur tgohur gtohur ogthur gothur tohgur othgur thogur htogur ohtgur hotgur tghour gthour thgour htgour ghtour hgtour oghtur gohtur ohgtur hogtur ghotur hgotur tughor utghor tguhor gtuhor ugthor guthor tuhgor uthgor thugor htugor uhtgor hutgor tghuor gthuor thguor htguor ghtuor hgtuor ughtor guhtor uhgtor hugtor ghutor hgutor oughtr uoghtr oguhtr gouhtr ugohtr guohtr ouhgtr uohgtr ohugtr hougtr uhogtr huogtr oghutr gohutr ohgutr hogutr ghoutr hgoutr ughotr guhotr uhgotr hugotr ghuotr hguotr rought orught ruoght uroght ourght uorght roguht orguht rgouht grouht ogruht goruht rugoht urgoht rguoht gruoht ugroht guroht ougrht uogrht ogurht gourht ugorht guorht rouhgt oruhgt ruohgt urohgt ourhgt uorhgt rohugt orhugt rhougt hrougt ohrugt horugt ruhogt urhogt rhuogt hruogt uhrogt hurogt ouhrgt uohrgt ohurgt hourgt uhorgt huorgt roghut orghut rgohut grohut ogrhut gorhut rohgut orhgut rhogut hrogut ohrgut horgut rghout grhout rhgout hrgout ghrout hgrout oghrut gohrut ohgrut hogrut ghorut hgorut rughot urghot rguhot gruhot ugrhot gurhot ruhgot urhgot rhugot hrugot uhrgot hurgot rghuot grhuot rhguot hrguot ghruot hgruot ughrot guhrot uhgrot hugrot ghurot hgurot oughrt uoghrt oguhrt gouhrt ugohrt guohrt ouhgrt uohgrt ohugrt hougrt uhogrt huogrt oghurt gohurt ohgurt hogurt ghourt hgourt ughort guhort uhgort hugort ghuort hguort
Note: these 'words' (valid or invalid) are all the permutations of the word trough. These words are obtained by scrambling the letters in trough.