rater arter rtaer traer atrer tarer raetr aretr reatr eratr aertr eartr rtear trear retar ertar terar etrar aterr taerr aetrr eatrr tearr etarr ratre artre rtare trare atrre tarre rarte arrte rrate rrate arrte rarte rtrae trrae rrtae rrtae trrae rtrae atrre tarre artre ratre trare rtare raert arert reart erart aerrt earrt raret arret rraet rraet arret raret rerat errat rreat rreat errat rerat aerrt earrt arert raert erart reart rtera trera retra ertra terra etrra rtrea trrea rrtea rrtea trrea rtrea rerta errta rreta rreta errta rerta terra etrra trera rtera ertra retra aterr taerr aetrr eatrr tearr etarr atrer tarer arter rater traer rtaer aertr eartr aretr raetr eratr reatr terar etrar trear rtear ertar retar
Note: these 'words' (valid or invalid) are all the permutations of the word rater. These words are obtained by scrambling the letters in rater.