In case anyone's curious, the longest word with unique letters (as well as the most distinct letters) is "obliges".<p>If we forbid 0, we get "bilges" and "sleigh". Both of which strike me as great opportunities for an extremely obscure Easter egg in an adventure game ...<p>Also, for completeness: 0O, 1I, 2Z, 3E, 4H, 5S, 6G, 7L, 8B.<p>So you can `grep -ix '[iozehsglb]*' /usr/share/dict/words` yourself.