I think you may have filled out the PuzzGrid wrong. For the "ball" category, balls should have been accepted. For the "plaintiffs" and "defendants" category, it will accept either "landmark" or "famous" as answers. I answered SCOTUS and that should've been accepted.

Thanks for the feedback. I'm just learning how to encode the description so that all acceptable answers are accepted. However, 'SCOTUS' alone isn't a correct category, the key distinction between two categories is that one consists of plaintiffs and the other of defendants in Supreme Court cases.