Following is an exert from learnthebible.org! The terms Holy Ghost and Holy Spirit are used synonymously!
"Holy Ghost is the correct name theologically. More and more, we are seeing doctrine attacked by the removal of established theological terms. The term, propitiation, which is rich in doctrinal meaning has been removed from many modern English versions. English books on theology and doctrine well into the twentieth century freely use Holy Ghost as the biblical term. When we remove this term from our vocabularies, we separate ourselves one step further from the teaching of those in the past who made the Bible their constant companion. The name, Holy Ghost, is used 90 times in the King James Bible. It is used in historical documents, doctrinal statements, and in libraries of books. When we allow God's people to become uncomfortable with these grand terms, we make them a bit dumber in understanding the richness of God's word."
Hope this helps!