peg vs pin

peg and pin both are nouns.

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

As nouns, pin is a hypernym of peg; that is, pin is a word with a broader meaning than peg:

peg: a wooden pin pushed or driven into a surface
pin: a small slender (often pointed) piece of wood or metal used to support or fasten or attach things

As nouns, peg and pin are synonyms defined as:

peg and pin: a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing

Other synonyms of peg include oarlock, rowlock, thole, tholepin.

As nouns, peg and pin are synonyms defined as:

Other synonyms of peg include stick.

As nouns, peg and pin are synonyms defined as:

peg and pin: small markers inserted into a surface to mark scores or define locations etc.

peg (noun)	pin (noun)
a wooden pin pushed or driven into a surface	a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing	a piece of jewelry that is pinned onto the wearer's garment
regulator that can be turned to regulate the pitch of the strings of a stringed instrument	axis consisting of a short shaft that supports something that turns
a prosthesis that replaces a missing leg	a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing
informal terms for the leg	a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target
small markers inserted into a surface to mark scores or define locations etc.	flagpole used to mark the position of the hole on a golf green
	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
	informal terms for the leg
	small markers inserted into a surface to mark scores or define locations etc.
	when a wrestler's shoulders are forced to the mat

peg (verb)	pin (verb)
stabilize (the price of a commodity or an exchange rate) by legislation or market operations	(chess) immobilize a piece
fasten or secure with a wooden pin	attach or fasten with pins
pierce with a wooden pin or knock or thrust a wooden pin into	pierce with a pin
succeed in obtaining a position	to hold fast or prevent from moving