All words are stored into the file called Words.plist.
If you want to add/edit the existing words in the .plist file you can easily do that, just please note that Wordzy supports 4, 6 and 9-letter words.
Check the existing words in the Words.plist file to get an idea of that.

1. Select a Navigation Controller in the Storyboard, then open the Document Outline panel (if it’s not already open). Check this picture: http://s18.postimg.org/wip2yc7y1/sample.jpg
2. Select Navigation Bar item in the list, then the icon of the Attributes Inspector panel on the right
3. Edit Bar Tint, Title Font and Title Color as you wish