pinhead vs pin

pinhead and pin both are nouns.

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

pinhead (noun)	pin (noun)
the head of a pin	a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
an ignorant or foolish person	a piece of jewelry that is pinned onto the wearer's garment
	axis consisting of a short shaft that supports something that turns
	a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing
	a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target
	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

pinhead (verb)	pin (verb)
	(chess) immobilize a piece
	attach or fasten with pins
	pierce with a pin
	to hold fast or prevent from moving