If you're working with Player Ranks and you want these not to conflict over the chat command "ranks", add the following line of code and "rankings" will be registered with Player Rankings.
Edit the PlayerRankings.cs file in Notepad or Notepad++
Add the bold text below to your PlayerRankings.cs file.
Now in chat, you can use the Player Rankings /say command of "ranks" or "rankings". Unless Player Ranks overwrites the "ranks" command.