MWh vs megawatt-hour

MWh and megawatt-hour both are nouns.

Word	Noun	Adjective	Verb	Adverb
MWh	Yes	No	No	No
megawatt-hour	Yes	No	No	No

As nouns, MWh and megawatt-hour are synonyms defined as:

MWh and megawatt-hour: a unit of energy equal to the work done by a power of 1000000 watts operating for one hour.

Other synonyms of MWh include megawatt hour.

MWh (noun)	megawatt-hour (noun)
a unit of energy equal to the work done by a power of 1000000 watts operating for one hour.	a unit of energy equal to the work done by a power of 1000000 watts operating for one hour.