Some comments:

* Make sure you have a consistent indentation style. It makes it difficult to follow the code flow, if there are multiple lines with different indentation.
* You should separate the view and the game logic. Having both the Swing design setup and the actual game logic mixed up—in a single method—makes the code very hard to navigate. Ideally, both should be in separate classes.
* Consider making a subclass of `JFrame` for your game view. It will be the only thing responsible for setting up the visuals. You can pass it a `GameStructure` object (which would be only the game logic), so it can combine everything.
* `for(j = 0; j<64; j++)` — Instead of hard-coding the length of the `worldList`, you should be able to adjust automatically if I add new words to the word list without changing anything else.
* `tf.addActionListener(new ActionListener() { …` — Instead of having an anonymous listener, consider making an actual type to clean everything up. As you only need to have a single listener, you can also make the class you’re in implement `ActionListener`, so you can pass `this` to `addActionListener`.