there's a school of shouts, a school of spells on the map, a rune school. They are also magical, so let's compare them as well. What's wrong with that? The rune and shout schools have a clear system.
Runic magic is a characteristic of the dwarf race, so it would be more appropriate to compare it with Knight's Preparation, Necromancy of the Necromancer, Irresistible Magic of the Warlock, etc. And if you compare it with the 4 schools of magic, then you can compare all other special abilities and the entire skill wheel.
The shout school is not magical at all (if "shout school" refers to the battle cries of orcs), because one of the main characteristics of orcs is their complete inability to use magic.