nauch anuch nuach unach aunch uanch nacuh ancuh ncauh cnauh acnuh canuh nucah uncah ncuah cnuah ucnah cunah aucnh uacnh acunh caunh ucanh cuanh nauhc anuhc nuahc unahc aunhc uanhc nahuc anhuc nhauc hnauc ahnuc hanuc nuhac unhac nhuac hnuac uhnac hunac auhnc uahnc ahunc haunc uhanc huanc nachu anchu ncahu cnahu acnhu canhu nahcu anhcu nhacu hnacu ahncu hancu nchau cnhau nhcau hncau chnau hcnau achnu cahnu ahcnu hacnu chanu hcanu nucha uncha ncuha cnuha ucnha cunha nuhca unhca nhuca hnuca uhnca hunca nchua cnhua nhcua hncua chnua hcnua uchna cuhna uhcna hucna chuna hcuna auchn uachn acuhn cauhn ucahn cuahn auhcn uahcn ahucn haucn uhacn huacn achun cahun ahcun hacun chaun hcaun uchan cuhan uhcan hucan chuan hcuan
Note: these 'words' (valid or invalid) are all the permutations of the word nauch. These words are obtained by scrambling the letters in nauch.