Narrator
Part of speech: noun
Definition: One who narrates or tell stories. The person or the "voice" whose viewpoint is used in telling a story. The person providing the voice-over in a documentary.
Example sentence: In 'A Scandalous Woman,' the eventually distraught narrator watches as her high-spirited friend is beaten down - literally and figuratively - by Ireland's pious customs.
Storyteller
Part of speech: noun
Definition: a person who relates stories through one medium or another to an audience.
Example sentence: I always say that I don't believe I'm a chef. I try to be a storyteller.