As a writer, it's your world so make it up. You decide. There are 'fantasy conventions' but they are quite broad and flexible. But some titles/areas, such as necromancer, would (may) be more restricted than others, say wizard or mage. I say 'may' because you can try anything you like--there are no hard-set rules, and even hard-set rules can be broken at times. Whatever system of naming you describe/create, it should fit the world you created, be logical, consistent, and make sense to the reader. I had to set out to do it in the world I created for Flank Hawk. There are wizards, enchanters, healers, necromancers among others. And varying levels/ranks based upon ability for some--such as for wizards (not in any particular order) greater, lesser, journeyman, grand, imperial, apprentice, etc. Although there isn't a chart listed anywhere in the novel, through context of the story and title, the reader can grasp and understand the 'system'. Yes, I have a chart and information so that I kept it consistent within Flank Hawk and the sequel that I am currently writing.
Well, in Harry Potter, Hogwarts is a school of magic. So everybody in there is a "mage," but Rowling calls them sorcerers I think, can't recall.
I'm glad you liked the idea. I'm always thinking about how to switch the old standards up to make reading more fun.
I like TWErvin2 post up there. To expand on it, when I'm writing a story I make a seperate file that lists and describes everything unique. Example: Characters: Bob: I will write his psych profile. I will list powers he has since I like SF/Fantasy. Weapons: Tesla 5000: Bob's gun given to him by a transdimensional cyberdonkey. It shoots charged crayon dust, etc. Gear: Norand Exo: Bob's exoskeleton. Tilberg Spiderline: Bob's monomolecular grappling hook. I keep this file open so that I don't forget something important about the character. So far, my books run about 600 pages and if Bob has some weapon in chapter one I want him to pull it in chapter twenty, not something else. Also, the personality profile is important to be because over the months of writing I might change my feelings about the character and write them out of character. I tend to be a very positive person and want bad guys to be good guys in the end, but that's not always right. The guide keeps me on track.
