surge usrge sruge rsuge ursge rusge sugre usgre sgure gsure ugsre gusre srgue rsgue sgrue gsrue rgsue grsue urgse rugse ugrse gurse rguse gruse sureg usreg srueg rsueg urseg ruseg suerg userg seurg esurg uesrg eusrg sreug rseug serug esrug resug ersug uresg ruesg uersg eursg reusg erusg suger usger sguer gsuer ugser guser suegr usegr seugr esugr uesgr eusgr sgeur gseur segur esgur gesur egsur ugesr guesr uegsr eugsr geusr egusr srgeu rsgeu sgreu gsreu rgseu grseu sregu rsegu sergu esrgu resgu ersgu sgeru gseru segru esgru gesru egsru rgesu gresu regsu ergsu gersu egrsu urges ruges ugres gures rgues grues uregs ruegs uergs eurgs reugs erugs ugers guers uegrs eugrs geurs egurs rgeus greus regus ergus gerus egrus
Note: these 'words' (valid or invalid) are all the permutations of the word surge. These words are obtained by scrambling the letters in surge.