It’s going to depend on your worldview and how you believe humans are constructed. Your view might nit be my view and this is not one of those things where anybody knows the “Truth(th)”. You have to find your own way.
A couple of us including me outlines out cosmologies here.
So in MY view - which is influenced by taoism, a spirit is the core, immortal spark of “divine” (or whatever you want to call that), the essence of consciousness that is pre-incarnation.
But there are many many layers in incarnation (for want of a better word - I realise most of these are not “carnal” by definition) - and the physical is only the last in a long line. Every lyer, or body, can interact with certain parts of the universe.
This is why it’s possible to have conscious beings that can interact energetically but not physically - they have incarnated into energy bodies or “sheathes” but not into human-qi or physical bodies.
Thus a ghost is a spirit who has incarnated all the way down into a physical body and has recently left it, and returned to the very next available energy body state, which is having a human0qi body. A human ghost isn’t really dead yet, in taoism. To be a human, the spirit has taken it’s higher sheathes and put them into both a qi and a human body - it must leave both to stop being human.
This, imo, is why there’s no such thing as a “human spirit”. Because being human is a thing a spirit does, it’s an experience, it’s not what it is. But a “soul” is any combination of spirit plus one or more bodies/sheathes/layers of incarnated being, thus you can “be a human soul” by virtue of being in the middle of a human experience at the time.
.