failure vs fail

failure is a noun but fail is not a noun.

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

failure (noun)	fail (noun)
an act that fails
an unexpected omission
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 (verb)	fail (verb)
	stop operating or functioning
	deteriorate
	prove insufficient
	disappoint, prove undependable to; abandon, forsake
	become bankrupt or insolvent; fail financially and close
	be unsuccessful
	fail to get a passing grade
	fail to do something; leave something undone
	judge unacceptable
	be unable
	fall short in what is expected