Holy | The Ghost Hunting Parablog

Just out of curiousity. As believers.. why do we call the Holy Spirit a Ghost?

Question: Where did this come from? I noticed that the King James Version is one of the few bibles that refer to the Spirit of God as a Holy Ghost. But what I do not understand is why change when the reference to Him in John 4:24 “God is Spirit and they that worship Him [...]