movie categories

No, there is no such thing.
The snapshot search feature is about snapshots, not movies.
This feature uses snapshot tags, and tags are not supposed to help solving in any way. They must only describe what anyone can actually see on the shot (so that it can be searched through our search engine), not what you may know having already seen the scene/movie.

If you wanna find Archive shots from comedies, though, you should visit this page: https://whatthemovie.com/search?t=genre&q=Comedy
You can browse other genres by clicking on genres on any movie page (Info tab).

Thank you.