ugler guler ulger luger gluer lguer ugelr guelr ueglr euglr geulr egulr ulegr luegr uelgr eulgr leugr elugr gleur lgeur gelur eglur legur elgur uglre gulre ulgre lugre glure lgure ugrle gurle urgle rugle grule rgule ulrge lurge urlge rulge lruge rluge glrue lgrue grlue rglue lrgue rlgue ugerl guerl uegrl eugrl geurl egurl ugrel gurel urgel rugel gruel rguel uergl eurgl uregl ruegl erugl reugl gerul egrul greul rgeul ergul regul ulerg luerg uelrg eulrg leurg elurg ulreg lureg urleg ruleg lrueg rlueg uerlg eurlg urelg ruelg erulg reulg lerug elrug lreug rleug erlug relug gleru lgeru gelru eglru legru elgru glreu lgreu grleu rgleu lrgeu rlgeu gerlu egrlu grelu rgelu erglu reglu lergu elrgu lregu rlegu erlgu relgu
Note: these 'words' (valid or invalid) are all the permutations of the word ugler. These words are obtained by scrambling the letters in ugler.