the spirit- in days gone by people would visit the local "spirits" and drink themselves into a slumber therefore "letting go" so to speak or "let it all hang out" . More specifically "sin". Therefore allowing the "evil" spirits to enter into them.

Jesus released the spirits who then entered the swine who then ran off a cliff.

the soul is what the devil "satan" desires, this is you, you do not have a soul, you are a soul, you "have" a body which contains you "your soul". The body is the "temple of God", you are the soul in the temple. You can thank Jesus for that, he opened the door for you to have direct communion with God. If you so choose to .
So to the best of my ability to describe my understanding of what a soul is; "it is you"!