fall vs flop

fall and flop both are nouns.

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

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

fall (noun)	flop (noun)
a sudden drop from an upright position	the act of throwing yourself down; collapse; sink
the act of surrendering (usually under agreed conditions)	a complete failure
a lapse into sin; a loss of innocence or of chastity	someone who is unsuccessful
a sudden sharp decrease in some quantity	an arithmetic operation performed on floating-point numbers
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)	flop (verb)
occur at a specified time or place	fall suddenly and abruptly
decrease in size, extent, or range	fall loosely
pass suddenly and passively into a state of body or mind	fail utterly; collapse
be born, used chiefly of lambs
come out; issue
assume a disappointed or sad expression
begin vigorously
come as if by falling
be cast down
go as if by falling
fall or flow in a certain way
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

fall (adverb)	flop (adverb)
	with a flopping sound
	completely