Why doesn't duolingo make a word list?
I think it would be much easier if they make the word list for each chapter that sums up all the words that appeared from the quizzes. Also, word list would help review what I learned, and actually I want word list for this reason.
Duolingo actually has a words list, but it is being tested and is only available on five courses, a group Swedish is not in. Hopefully they can perfect it soon and make it available for all languages!
In the meantime, you could try out the course on Memrise that has all the words from the Duolingo course.