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