fall vs pin

fall and pin both are nouns.

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

As nouns, fall and pin are synonyms defined as:

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

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