fall vs crash

fall and crash both are nouns.

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

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

fall (noun)	crash (noun)
a sudden drop from an upright position	the act of colliding with something
the act of surrendering (usually under agreed conditions)	a serious accident (usually involving one or more vehicles)
a lapse into sin; a loss of innocence or of chastity	a loud resonant repeating noise
a sudden sharp decrease in some quantity	a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
a free and rapid descent by the force of gravity	(computer science) an event that causes a computer system to become inoperative
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)	crash (verb)
occur at a specified time or place	sleep in a convenient place
decrease in size, extent, or range	stop operating
pass suddenly and passively into a state of body or mind	undergo a sudden and severe downturn
be born, used chiefly of lambs	undergo damage or destruction on impact
come out; issue	break violently or noisily; smash
assume a disappointed or sad expression	cause to crash
begin vigorously	hurl or thrust violently
come as if by falling	enter uninvited; informal
be cast down	move with, or as if with, a crashing noise
go as if by falling	fall or come down violently
fall or flow in a certain way	move violently as through a barrier
move downward and lower, but not necessarily all the way	make a sudden loud sound
move in a specified direction	occupy, usually uninvited
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