nival inval nvial vnial ivnal vinal niavl inavl naivl anivl ianvl ainvl nvail vnail navil anvil vanil avnil ivanl vianl iavnl aivnl vainl avinl nivla invla nvila vnila ivnla vinla nilva inlva nliva lniva ilnva linva nvlia vnlia nlvia lnvia vlnia lvnia ivlna vilna ilvna livna vlina lvina nialv inalv nailv anilv ianlv ainlv nilav inlav nliav lniav ilnav linav naliv anliv nlaiv lnaiv alniv laniv ialnv ailnv ilanv lianv alinv lainv nvali vnali navli anvli vanli avnli nvlai vnlai nlvai lnvai vlnai lvnai nalvi anlvi nlavi lnavi alnvi lanvi valni avlni vlani lvani alvni lavni ivaln vialn iavln aivln vailn aviln ivlan vilan ilvan livan vlian lvian ialvn ailvn ilavn liavn alivn laivn valin avlin vlain lvain alvin lavin
Note: these 'words' (valid or invalid) are all the permutations of the word nival. These words are obtained by scrambling the letters in nival.