navvy anvvy nvavy vnavy avnvy vanvy navvy anvvy nvavy vnavy avnvy vanvy nvvay vnvay nvvay vnvay vvnay vvnay avvny vavny avvny vavny vvany vvany navyv anvyv nvayv vnayv avnyv vanyv nayvv anyvv nyavv ynavv aynvv yanvv nvyav vnyav nyvav ynvav vynav yvnav avynv vaynv ayvnv yavnv vyanv yvanv navyv anvyv nvayv vnayv avnyv vanyv nayvv anyvv nyavv ynavv aynvv yanvv nvyav vnyav nyvav ynvav vynav yvnav avynv vaynv ayvnv yavnv vyanv yvanv nvvya vnvya nvvya vnvya vvnya vvnya nvyva vnyva nyvva ynvva vynva yvnva nvyva vnyva nyvva ynvva vynva yvnva vvyna vvyna vyvna yvvna vyvna yvvna avvyn vavyn avvyn vavyn vvayn vvayn avyvn vayvn ayvvn yavvn vyavn yvavn avyvn vayvn ayvvn yavvn vyavn yvavn vvyan vvyan vyvan yvvan vyvan yvvan
Note: these 'words' (valid or invalid) are all the permutations of the word navvy. These words are obtained by scrambling the letters in navvy.