niger inger ngier gnier igner giner niegr inegr neigr enigr iengr eingr ngeir gneir negir engir genir egnir igenr gienr iegnr eignr geinr eginr nigre ingre ngire gnire ignre ginre nirge inrge nrige rnige irnge ringe ngrie gnrie nrgie rngie grnie rgnie igrne girne irgne rigne grine rgine nierg inerg neirg enirg ienrg einrg nireg inreg nrieg rnieg irneg rineg nerig enrig nreig rneig ernig renig ierng eirng ireng rieng ering reing ngeri gneri negri engri genri egnri ngrei gnrei nrgei rngei grnei rgnei nergi enrgi nregi rnegi erngi rengi gerni egrni greni rgeni ergni regni igern giern iegrn eigrn geirn egirn igren giren irgen rigen grien rgien iergn eirgn iregn riegn erign reign gerin egrin grein rgein ergin regin
Note: these 'words' (valid or invalid) are all the permutations of the word niger. These words are obtained by scrambling the letters in niger.