Fairy Ghost?

Is a banshee a ghost or is she a fairy?

Banshee (bean sidhe) means "fairy woman" or "woman of the fairy mound" according to most translations I've seen.  So logically, a banshee is a fairy.  However, some legends say that banshees are women who died in childbirth or were murdered, which would make them ghosts. Right?  Many drawings of banshees picture them as spectral figures.

So what's your position?  Is a banshee a ghost or a fairy?  Could she be a combination?  And what would be the implications of that?