North is a specific direction, one of the four cardinal directions.
Up is a more general term that can refer to:
* Elevation: Going higher in altitude, like going up a hill.
* Direction: Going in a direction that is higher than the current position, but not necessarily north (like going up a flight of stairs).
* Inversion: The opposite of down, in a figurative sense, like "moving up the corporate ladder".
While "north" is always a specific direction, "up" can have many different meanings depending on the context.