LOVED THIS GRID! At first I was a little confused because of all the letters, but I managed to get all the categories and identify them for the full 10 points. Cheers!

I like the ideas, but there are too many cases where you can switch letters and still have a valid solution.
For example, C can be swapped with F, E or D. B also can switch with F, E, or D. Or, more complicatedly, Y replaces O, O replaces E, E replaces either C or B, and C or B take the place of Y.