Freddy feels more ghosty or at least vengeful spirity (which really is just deluxe ghost imo) to me considering he was a dude who died and lacks physical form most of the time.
Sadako is described as having the appearance of a Yurei, which is analguous to a ghost in western culture. If your only condition for Pac chomping is "can be reasonably described as a ghost" then she's deffo there.