pin vs fall

pin and fall both are nouns.

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

As nouns, pin and fall are synonyms defined as:

pin (noun)	fall (noun)
a small slender (often pointed) piece of wood or metal used to support or fasten or attach things	a sudden drop from an upright position
a piece of jewelry that is pinned onto the wearer's garment	the act of surrendering (usually under agreed conditions)
axis consisting of a short shaft that supports something that turns	a lapse into sin; a loss of innocence or of chastity
a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing	a sudden sharp decrease in some quantity
a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target	a free and rapid descent by the force of gravity
flagpole used to mark the position of the hole on a golf green	a sudden decline in strength or number or importance
cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown	when a wrestler's shoulders are forced to the mat
informal terms for the leg	a movement downward
small markers inserted into a surface to mark scores or define locations etc.	a downward slope or bend
when a wrestler's shoulders are forced to the mat	the season when the leaves fall from the trees
	the time of day immediately following sunset

pin (verb)	fall (verb)
(chess) immobilize a piece	occur at a specified time or place
attach or fasten with pins	decrease in size, extent, or range
pierce with a pin	pass suddenly and passively into a state of body or mind
to hold fast or prevent from moving	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