Specter
Part of speech: noun
Definition: A ghostly apparition.
Apparition
Part of speech: noun
Definition: An act of becoming visible; appearance; visibility.The thing appearing; a visible object; a form.An unexpected, wonderful, or preternatural appearance; especially something such as a ghost or phantom.(Astronomy) The first appearance of a star or other luminary after having been invisible or obscured;—opposed to occultation.