outage vs breakdown

outage and breakdown both are nouns.

Word	Noun	Adjective	Verb	Adverb
outage	Yes	No	No	No
breakdown	Yes	No	No	No

As nouns, breakdown is a hypernym of outage; that is, breakdown is a word with a broader meaning than outage:

Other hypernyms of outage include equipment failure.

outage (noun)	breakdown (noun)
a temporary suspension of operation (as of computers)	the act of disrupting an established order so it fails to continue
the amount of something (as whiskey or oil) lost in storage or transportation	an analysis into mutually exclusive categories
	a cessation of normal operation
	(biology) the process of decay caused by bacterial or fungal action
	(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
	a mental or physical breakdown