fall vs fly

fall and fly both are nouns.

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

As verbs, fly is a hyponym of fall; that is, fly is a word with a more specific, narrower meaning than fall:

fall (noun)	fly (noun)
a sudden drop from an upright position	(baseball) a hit that flies up in the air
the act of surrendering (usually under agreed conditions)	two-winged insects characterized by active flight
a lapse into sin; a loss of innocence or of chastity	an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth
a sudden sharp decrease in some quantity	flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent
a free and rapid descent by the force of gravity	fisherman's lure consisting of a fishhook decorated to look like an insect
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 (adjective)	fly (adjective)
	(British informal) not to be deceived or hoodwinked

fall (verb)	fly (verb)
occur at a specified time or place	decrease rapidly and disappear
decrease in size, extent, or range	change quickly from one emotional state to another
pass suddenly and passively into a state of body or mind	transport by aeroplane
be born, used chiefly of lambs	hit a fly
come out; issue	travel through the air; be airborne
assume a disappointed or sad expression	operate an airplane
begin vigorously	move quickly or suddenly
come as if by falling	run away quickly
be cast down	travel over (an area of land or sea) in an aircraft
go as if by falling	travel in an airplane
fall or flow in a certain way	pass away rapidly
move downward and lower, but not necessarily all the way	cause to fly or float
move in a specified direction	be dispersed or disseminated
descend in free fall under the influence of gravity	display in the air or cause to float
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