inter niter itner tiner ntier tnier inetr nietr ientr eintr neitr enitr itenr tienr ietnr eitnr teinr etinr nteir tneir netir entir tenir etnir intre nitre itnre tinre ntire tnire inrte nirte irnte rinte nrite rnite itrne tirne irtne ritne trine rtine ntrie tnrie nrtie rntie trnie rtnie inert niert ienrt einrt neirt enirt inret niret irnet rinet nriet rniet iernt eirnt irent rient erint reint nerit enrit nreit rneit ernit renit itern tiern ietrn eitrn teirn etirn itren tiren irten riten trien rtien iertn eirtn iretn rietn eritn reitn terin etrin trein rtein ertin retin nteri tneri netri entri tenri etnri ntrei tnrei nrtei rntei trnei rtnei nerti enrti nreti rneti ernti renti terni etrni treni rteni ertni retni
Note: these 'words' (valid or invalid) are all the permutations of the word inter. These words are obtained by scrambling the letters in inter.