kW-hr vs kilowatt hour

kW-hr and kilowatt hour both are nouns.

Word	Noun	Adjective	Verb	Adverb
kW-hr	Yes	No	No	No
kilowatt hour	Yes	No	No	No

As nouns, kW-hr and kilowatt hour are synonyms defined as:

kW-hr and kilowatt hour: a unit of energy equal to the work done by a power of 1000 watts operating for one hour

Other synonyms of kW-hr include B.T.U., Board of Trade unit.

kW-hr (noun)	kilowatt hour (noun)
a unit of energy equal to the work done by a power of 1000 watts operating for one hour	a unit of energy equal to the work done by a power of 1000 watts operating for one hour