NEUTRAL WIRE: That wire which completes the returning path of electricity is known as neutral. Without neutral wire any equipment will not energizes. if you disconnect the neutral wire bulb will not glow anymore even the switch is at ON position.
Figure 1 shows a bulb is connecting with live and neutral
EARTH WIRE: It is that wire which is used for safety only. Without this wire every electrical appliances will work but in case of fault it gives shock to person who touches its body.