High potential between ground and neutral wires in wall outlet
You have a ground fault and thus no ground which is defined by 0 V.
Neutral should be earth grounded outside at your distribution transformer and your voltage drop permitted is 10% of line on neutral if drawing maximum current in your location. (e.g. 100 or 200A)
Check at breaker box and move towards the problem (inside or out) to get it fixed otherwise if you happen to touch an appliance like a 3 pronged device AND the plumbing which ought to be earth grounded, you will see a potential risk voltage but it MAY be high impedance floating so lower current depending on the cable capacitance.