Joule is a unit of energy; Joule is the same as watt-second. A watt is a unit of power, meaning, joules/second (joules per second). It is used to measure how fast energy is produced, used up, or transferred.
kilowatt (1000 watts) and megawatt (1,000,000 watts) are simply multiples of the watt.
Electricity bills use the unit kilowatt-hours - it refers to the energy you use if you use a power of one kilowatt, during an hour. Note that a kilowatt is a unit of power; kilowatt-hour is again a unit of energy (equivalent to 3,600,000 Joules or watt-seconds).
MWh and GWh are, once again, multiples of the watt-hour (or, if you prefer, of the kilowatt-hour).
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