Psionics is the term generally used to describe paranormal abilities such as telepathy, telekinesis, etc—and there are loads of “etc” abilities—and people with psionic abilities are typically labeled as psychics.
That’s paraphrased from this Wikipedia article, but don’t worry. I don’t depend on Wikipedia to inform me. Rather, about forty years of being a reader is what planted the idea in my mind that any person who displays such abilities falls under the general label of psychic.
Anne McCaffrey called them Talents; the Xmen who have such abilities are called mutants, etc, etc, but generally, they’re psychics: People who have psionic abilities.
Of course, I didn’t just go by what I’d picked up as a reader over those many years, because there are people who study this stuff. I looked around, and purchased The Encyclopedic Psychic Dictionary.
With the exception of one, every ability Discord has is listed in it, though not necessarily by the same term.
Example: Telekinesis is also often called Psychokinesis, but I’ve seen the first used more often, so that’s the term I chose to use.
There’s another reason in why I chose to label her a psychic. I have another series with characters with psychic abilities, and that series is The Psionics. I didn’t want to have Discord calling herself a “Psionic” and possibly cause confusion that the two series were related. They are not.
As for why Discord has the abilities she does, well that would be because I wanted her to have them for various reasons. 🙂