Especially because all these rules almost always boil down to "use these terms to mean what I say they mean or I'll get angry at you." Examples:
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I don't care what you personally believe the difference between a drake, dragon, and wyvern is. In your story they can refer to wingless lizards with four legs, flying lizards with four legs, and flying lizards with two legs respectively, but in this story they're all flying lizards with four legs but drakes are venomous, dragons breathe fire, and Wyverns have an electric eel style shock and that is equally valid.
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Wizard, Sorcerer, and Warlock do not mean "Mage by training, mage by birth, and mage by pact." They mean those things in Dungeons and Dragons but I will lick Satan's taint before I bow to WOTC on terminology. If you want to use those terms to mean those things, go ahead, but if you um ackshully a random non DND Fantasy story about those terms...why? Why do you want to try and limit someone else's imagination? (also even DnD didn't use those terms until 3rd edition)
Just...let people play with their imaginations, okay?
For that matter "druid" does not mean "shapeshifting nature-based mage."
They're ancient Celtic priests who may or may not have been able to curse men with phantom labor pains.
