Would the affix template you suggested work for this word?

RE: The text itself is located at Module:category tree/poscatboiler/data/lemmas if you want to modify it yourself. I am concerned that if I did that, it might affect other people. I wouldn't want to change something that they are also using. So I just added an explanation to the page after the postcatboiler text.

That page contains the information for various categories, such as which parent they should go in and what description to show. If it's changed, several categories would be affected, but in this case I think that's for the better. I've made the change myself now, you can see what I did. Note that now, Category:Wauja suffixes has a different description, but so do Category:English suffixes, Category:German suffixes and so on. This is why this templated category system is useful; it allows all the categories to be changed simultaneously from one central location.