un·dead

– adj.
1. no longer alive but animated by a supernatural force, as a vampire or zombie.

vam·pire

– noun
1. a preternatural being, commonly believed to be a reanimated corpse, that is said to suck the blood of sleeping persons at night.
2. a corpse, animated by an undeparted soul or demon, that periodically leaves the grave and disturbs the living, until it is exhumed and impaled or burned.
3. a person who preys ruthlessly upon others; extortionist.