Neutral wire going into panel has ~120 volts on it
If you have a neutral wire removed from the neutral bus bar in your panel it is possible to see 120VAC on that wire if the circuit breaker for that circuit is turned on and there is a load connected to the circuit and load device is also turned on.

The disconnected neutral means that no return current is flowing in that circuit but with a connected load it is possible to see the 120VAC through the load when when measured.

This picture will help you see how you can measure the 120VAC on the neutral wire: