Question

distinguish between kilowatt and kilowatt hour

Answer 1

Kilowatt-a measure of one thousand watts of electrical power.
kilowatt hour-a measure of electrical energy equivalent to a power consumption of one thousand watts for one hour.

Answer 2

Kilowatt and kilowatt hour are both physical units which are used measure the amount of consumed electricity.

But there is a difference between these two units.

The kilowatt unit simply represents the electricity consumption.

But on the other hand,

The kilowatt hour unit represents that one kilowatt of electricity is used for one hour.

And in the practical life we use the kilowatt hour unit.