I think there's only one type of Contributor listed in parenthesis.
For anthology works, a lot of times goodreads list the credits as Editor(s) first and followed by Contributor(s).
Here are a few examples below:
https://www.goodreads.com/book/show/14002
https://www.goodreads.com/book/show/10894399
https://www.goodreads.com/book/show/21531436
Thanks for looking into it!