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