the word "spiritual" is pretty subjective, imo.
Agreed. I think it's entirely subjective.
But I'm curious, to anyone reading this, can you name the five easily? Is quantifying such a thing ridiculous?
I think it depends on the person (so again, just subjective). For me personally, I was never a very "spiritual" person outside of being inspired by the external universe ("the object"). Although that external wonder fuelled my interest in science, as a subjective being I never felt internally enlightened. But I think psychedelics helped me connect to an internal feeling/sensation/experience/whatever - that I can only describe in spiritual terms. I don't personally make a list or rank these experiences, but I do keep records and reflect on them.