metmom, when Moses appeared with Jesus and Elijah at the Transfiguration, was he a ghost?
No more that Elijah.
Moses died. God tells us that in Scripture.
Deuteronomy 34 34 Then Moses went up from the plains of Moab to Mount Nebo, to the top of Pisgah, which is opposite Jericho. And the Lord showed him all the land, Gilead as far as Dan, 2 all Naphtali, the land of Ephraim and Manasseh, all the land of Judah as far as the western sea, 3 the Negeb, and the Plain, that is, the Valley of Jericho the city of palm trees, as far as Zoar.
4 And the Lord said to him, “This is the land of which I swore to Abraham, to Isaac, and to Jacob, ‘I will give it to your offspring.’ I have let you see it with your eyes, but you shall not go over there.”
5 So Moses the servant of the Lord died there in the land of Moab, according to the word of the Lord, 6 and he buried him in the valley in the land of Moab opposite Beth-peor; but no one knows the place of his burial to this day. 7 Moses was 120 years old when he died. His eye was undimmed, and his vigor unabated.
BTW, there are no such things as ghosts.