roust orust ruost urost ourst uorst rosut orsut rsout srout osrut sorut rusot ursot rsuot sruot usrot surot ousrt uosrt osurt sourt usort suort routs oruts ruots urots ourts uorts rotus ortus rtous trous otrus torus rutos urtos rtuos truos utros turos outrs uotrs oturs tours utors tuors rostu orstu rsotu srotu osrtu sortu rotsu ortsu rtosu trosu otrsu torsu rstou srtou rtsou trsou strou tsrou ostru sotru otsru tosru storu tsoru rusto ursto rsuto sruto usrto surto rutso urtso rtuso truso utrso turso rstuo srtuo rtsuo trsuo struo tsruo ustro sutro utsro tusro sturo tsuro oustr uostr osutr soutr usotr suotr outsr uotsr otusr tousr utosr tuosr ostur sotur otsur tosur stour tsour ustor sutor utsor tusor stuor tsuor
Note: these 'words' (valid or invalid) are all the permutations of the word roust. These words are obtained by scrambling the letters in roust.