The dictionary is as advertised.
It lists all the dicks there are, including peckerheads and pricks. It's a complete list, though it doesn't always specify last names. Nonetheless, every single one is in there. It's nice to have such a useful reference.
Unfortunately, older dictionaries don't list or rank dicks in order of assholiness. But online dictionaries are being put together to do just that. Those are even better thing than a printed dictionary, because dicks are always "borrowing" or stealing them so they won't be found out. Damn you, Dick Cheney!.