fail vs failure

fail is not a noun while failure is a noun.

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

fail (noun)	failure (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

fail (verb)	failure (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