“Arts” or “Techniques” are other single word options that people won’t likely find it off to associate with martial skillsets. I don’t believe they’re used elsewhere in the OGL system itself, and they’re simple English words in common usage rather than another term of art players new to the genre might find it wearing to juggle.
Aside: It was a very welcome bit of nostalgia having this show up in my inbox from DT unexpectedly, I was much into the game back in high school. [Apologies if I just made anyone feel their years weighing, kids these days…] In any case, best wishes with your relaunch and I’m looking forward to getting a crack at your take on magic when it’s ready for press.