urase ruase uarse aurse rause aruse ursae rusae usrae surae rsuae sruae uasre ausre usare suare asure saure rasue arsue rsaue sraue asrue sarue uraes ruaes uares aures raues arues ureas rueas ueras euras reuas eruas uaers auers uears euars aeurs eaurs raeus areus reaus eraus aerus earus ursea rusea usrea surea rsuea sruea uresa ruesa uersa eursa reusa erusa usera suera uesra eusra seura esura rseua sreua resua ersua serua esrua uaser auser usaer suaer asuer sauer uaesr auesr ueasr euasr aeusr eausr usear suear uesar eusar seuar esuar aseur saeur aesur easur seaur esaur raseu arseu rsaeu sraeu asreu sareu raesu aresu reasu erasu aersu earsu rseau sreau resau ersau serau esrau aseru saeru aesru easru searu esaru
Note: these 'words' (valid or invalid) are all the permutations of the word urase. These words are obtained by scrambling the letters in urase.