failure vs failing

failure and failing both are nouns.

Word	Noun	Adjective	Verb	Adverb
failure	Yes	No	No	No
failing	Yes	Yes	No	No

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

failure (noun)	failing (noun)
an act that fails	failure to reach a minimum required performance
an unexpected omission	a flaw or weak point
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

failure (adjective)	failing (adjective)
	below acceptable in performance