The Ghost of Christmas Past is a well-known character from Charles Dickens' A Christmas Carol. However, there are several synonyms for this entity. One of the more common ones is "specter." A specter is a supernatural entity that is often associated with death. Another synonym is "apparition," which refers to a ghostly figure that appears and disappears quickly. A third synonym is "phantom," which is another word for ghost. A phantom is often depicted as a supernatural or illusory figure. Lastly, a synonym for the Ghost of Christmas Past is "wraith." A wraith is a supernatural entity that is often connected to death or impending doom.