I didn't know there was a 500-word limit until I tried to add a word to one quiz in design mode and the site complained about too many words. Originally, because there would be too much typing, I used the import function to add all of the answers. This does not enforce the limit. Maybe when the quiz is moderated it gets enforced.
Oh well, I guess I will have to keep the entries in the series to shorter versions. Maybe I can do this by using hidden answer components. I don't think any one of the entries has 500 unique words.
Super hard though, the differences between words like man, man's, tomorrow,tomorrow's, etc makes it difficult to get all of them. 805 isn't too bad though!