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I'm not 100% sure that your initial premise is correct. While a lay person might say 'fire magic' and 'death magic' are the meanings, this is just imprecise, not wrong. (Non-religious) Divinati...
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#2: Initial revision
I'm not 100% sure that your initial premise is correct. While a lay person might say 'fire magic' and 'death magic' are the meanings, this is just imprecise, not wrong. (Non-religious) Divination **is** magic. However I would expect a lay person to understand that pyromancy is not, for instance throwing fireballs, creating walls/protective circles of fire, or other general 'fire magic'. Similarly, necromancy isn't usually thought of as the raising of armies of skeletons, or zombie creation (from the dead, as opposed to voodoo's near-death). The [superpower wiki](https://powerlisting.fandom.com/wiki/Death_Magic) for example explicitly states 'death magic is not to be confused with necromancy'. However, if you wish to clarify these terms in your universe as their etymological meaning, then I would instead, search for (or create) words that define the misconception. As suggestions you could call general fire magic _pyromageía_, and skeleton raising or death-causing _necromageia_. (Mageia is the Greek term for magic (μαγεία) so this will keep the origin consistent). Then, just put in a scene where some novice character confuses the term, and a practitioner (of any of the four arts: pyromancy, pyromageia, necromancy or necromageia) corrects him/her and explains the differences.