A phantom, a ghost or elusive entity.
An image or representation of an idea; a representation of an ideal form; an apparition of some actual or imaginary entity, or of some aspect of reality.
An unsubstantial image, spectre, phantom.
Someone who returns home from travelling or exile or who is welcomed back after disgrace, especially having repented of former extravagant or immoral behaviour.
A marine fish, the cobia (Rachycentron canadum).