flame-out vs power outage

flame-out and power outage both are nouns.

Word	Noun	Adjective	Verb	Adverb
flame-out	Yes	No	No	No
power outage	Yes	No	No	No

As nouns, power outage is a hypernym of flame-out; that is, power outage is a word with a broader meaning than flame-out:

flame-out: the failure of a jet engine caused by an interruption of the fuel supply or by faulty combustion
power outage: equipment failure resulting when the supply of power fails

Other hypernyms of flame-out include power failure.

flame-out (noun)	power outage (noun)
the failure of a jet engine caused by an interruption of the fuel supply or by faulty combustion	equipment failure resulting when the supply of power fails
a complete or conspicuous failure