fall vs fail

fall is a noun but fail is not a noun.

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

As verbs, fail is a hypernym of fall; that is, fail is a word with a broader meaning than fall:

Other hypernyms of fall include go wrong, miscarry.

fall (noun)	fail (noun)
a sudden drop from an upright position
the act of surrendering (usually under agreed conditions)
a lapse into sin; a loss of innocence or of chastity
a sudden sharp decrease in some quantity
a free and rapid descent by the force of gravity
a sudden decline in strength or number or importance
when a wrestler's shoulders are forced to the mat
a movement downward
a downward slope or bend
the season when the leaves fall from the trees
the time of day immediately following sunset

fall (verb)	fail (verb)
occur at a specified time or place	stop operating or functioning
decrease in size, extent, or range	deteriorate
pass suddenly and passively into a state of body or mind	prove insufficient
be born, used chiefly of lambs	disappoint, prove undependable to; abandon, forsake
come out; issue	become bankrupt or insolvent; fail financially and close
assume a disappointed or sad expression	be unsuccessful
begin vigorously	fail to get a passing grade
come as if by falling	fail to do something; leave something undone
be cast down	judge unacceptable
go as if by falling	be unable
fall or flow in a certain way	fall short in what is expected
move downward and lower, but not necessarily all the way
move in a specified direction
descend in free fall under the influence of gravity
slope downward
drop oneself to a lower or less erect position
lose an upright position suddenly
to be given by assignment or distribution
be captured
fall to somebody by assignment or lot; passed
come into the possession of
to be given by right or inheritance
be inherited by
lose office or power
yield to temptation or sin
suffer defeat, failure, or ruin
lose one's chastity
die, as in battle or in a hunt
be due
come under, be classified or included
touch or seem as if touching visually or audibly
fall from clouds