I agree with using just the word "cast" but it would take a while to change all of it. I can start some later today. The categories that you listed can be deleted, although we'd have to ask our head admin first.
As it was said by NikkiSarah in Categories topic, they are going to remove all useless categories soon and since mentioned by you categories are not in their new guide, they will remove them too. Guess best thing you can do right now if you want to help and can not edit categories of pages yourself, is to provide them with links on pages where rework of categories is needed most.