The reason that “the Comforter” could not be given before Yeshua ascended to Heaven, and merged with Yehovah, is because only the Eternal (Yehovah) Spirit could bestow His Spirit within another entity or person. That is how the giving of the Ghost of Yeshua was made possible. Therefore we should not say “Holy Spirit”. Again, the difference between a spirit and a ghost, is that a ghost has experienced human habitation, whereas a spirit has never dwelled within a human body, unless you are speaking of demons, which are of another category, and another article.