failure vs flame-out

failure and flame-out both are nouns.

Word	Noun	Adjective	Verb	Adverb
failure	Yes	No	No	No
flame-out	Yes	No	No	No

As nouns, flame-out is a hyponym of failure; that is, flame-out is a word with a more specific, narrower meaning than failure:

failure (noun)	flame-out (noun)
an act that fails	the failure of a jet engine caused by an interruption of the fuel supply or by faulty combustion
an unexpected omission	a complete or conspicuous failure
an event that does not accomplish its intended purpose
a person with a record of failing; someone who loses consistently
lack of success
loss of ability to function normally
inability to discharge all your debts as they come due