Absolutely, as a child we had two in our old home. And I saw them, it was a husband and wife. In our last home in MN we lived in a very old home. We had a young mother, who walked back and forth in the hallway from bedroom to bed room. We called her Sarah. We found very old newspapers and childrens toys in our attic, and we believe she is still searching for her baby who died. When we moved, I lite a candle and went from room to room, and asked her to please accept the new owners, and that she should cross over because the baby is no longer there. My husband, his son, myself and a friend all saw her. Our friend turned so pale. He said "did you see that?" We just told him that was Sarah and she won't hurt you. He didn't come back very often after that.
I believe ghosts are lost souls still search to cross over. I believe Angels are friends and family who has passed on. And I do believe there is a difference.