drows rdows dorws odrws rodws ordws drwos rdwos dwros wdros rwdos wrdos dowrs odwrs dwors wdors owdrs wodrs rowds orwds rwods wrods owrds words drosw rdosw dorsw odrsw rodsw ordsw drsow rdsow dsrow sdrow rsdow srdow dosrw odsrw dsorw sdorw osdrw sodrw rosdw orsdw rsodw srodw osrdw sordw drwso rdwso dwrso wdrso rwdso wrdso drswo rdswo dsrwo sdrwo rsdwo srdwo dwsro wdsro dswro sdwro wsdro swdro rwsdo wrsdo rswdo srwdo wsrdo swrdo dowsr odwsr dwosr wdosr owdsr wodsr doswr odswr dsowr sdowr osdwr sodwr dwsor wdsor dswor sdwor wsdor swdor owsdr wosdr oswdr sowdr wsodr swodr rowsd orwsd rwosd wrosd owrsd worsd roswd orswd rsowd srowd osrwd sorwd rwsod wrsod rswod srwod wsrod swrod owsrd wosrd oswrd sowrd wsord sword
Note: these 'words' (valid or invalid) are all the permutations of the word drows. These words are obtained by scrambling the letters in drows.