pown opwn pwon wpon owpn wopn ponw opnw pnow npow onpw nopw pwno wpno pnwo npwo wnpo nwpo ownp wonp onwp nowp wnop nwop
Note: these 'words' (valid or invalid) are all the permutations of the word pown. These words are obtained by scrambling the letters in pown.