finish reading why's (poignant) guide to ruby

I seem to enjoy my programming language tutorials and fiction much better separate from each other. However, I do not mind the example code having a theme.

Due all sorts of changes in life, I’m still reading this. Now I’m at http://poignantguide.net/ruby/chapter-5.html#section4

I have a problem in the Making the swap -section:

I have the code_words in wordlist.rb and rest of the code in gibberish.rb

lynoure@aeonflux:~/Projects/ruby$ ruby gibberish.rb
Enter your new idea: catapult
gibberish.rb:6: undefined local variable or method `code_words’ for main:Object (NameError)

Why oh why?

Why’s (poignant) guide to ruby has so far been so fun to read that I think this will be an easy goal.