Witch
The term “witch” is an umbrella term. It is most often used in the cases of “broad” casters; that is, if a spell caster has a general use of magicks outside a particular group. So, a caster like Eleanora Blackwood might be labeled simply a Shadow Witch. This is because she uses a broad range of shadow spells, a “jack of all trades and a master of none”. Other witches may use shadow magicks, but they are labeled for what their specialty is. Thus a necromancer, blood witch, plague witch, dark shaman, and a warlock all utilize types of shadow magic, but each is specialized. The same works for Light Witches. A druid, thaumaturgist, wizard, shaman, and magi would be specialized with a light witch as one that dabbles in all types of light magicks.