I actually meant what’s like, the scientific term for people without magic! you can use that as a base for your slur
also, I think any group of people would always have a term, regardless of statistical position within the world.
For example, neurotypical vs neurodivergent.
even if a group is the “normal”, even if it’s just within the “not-normal” community, they’d have a term. it’s also often necessary for clarification purposes in medical and research papers (you can’t just say “the normal people”)