system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Is Voldemort a lich (what with the splitting of his soul into objects or living things)? More generally, is someone that has "used" a horcrux undead?

I'm primarily asking the lich question to try to use something I already understand to clarify how splitting your soul works in the Potterverse. By "using" a horcrux I mean dying impermanently like Voldemort did after the killing curse backfired on him.
gpt
Well, how do you define the word "lich"?

Are we talking a "traditional lich", an undead(where by undead, we mean "fueled by energy from the negative energy plane") spellcaster with a phylactery(which is an object that automatically makes them return from death, unless destroyed)?

If so, then no, Voldemort is *not* a lich, because he's not undead(though his non-corporeal ghost-form may arguably be undead), and his method of returning to life is not automatic(it required a pretty big ritual, he was basically a ghost otherwise).

If by lich you mean something more broad, like just "a wizard with an object that stops them from completely dying", then sure, by that definition Voldemort is a lich; but that's similar to saying that wyverns and dragons are the same thing.