Doppelganger

Noun

 * 1) A ghostly double of a living person, especially one that haunts such a person.
 * 2) An evil twin.
 * 3) A remarkably similar double.
 * 4) A person who has the same name as another.
 * 5) A fantastic monster that takes the forms of people, usually after killing them.

Thesaurus
actual thing, carbon copy, co-walker, copy, dead ringer, ditto, double, doubleganger, duplicate, equivalent, etheric double, exact counterpart, facsimile, fetch, homograph, homonym, homophone, idem, identical same, no other, none other, replica, selfsame, spit and image, spitting image, synonym, the same, the same difference, twin, very image, very same, wraith

Pronunciation

 * {{SAMPA|1=/"dQpl=.g{N.@(r)/}}
 * {{SAMPA|1=/"dApl=.g{N.@`/}}