dowel vs dowel pin

dowel and dowel pin both are nouns.

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

As nouns, dowel and dowel pin are synonyms defined as:

dowel and dowel pin: a fastener that is inserted into holes in two adjacent pieces and holds them together

Other synonyms of dowel include joggle.

dowel (noun)	dowel pin (noun)
a fastener that is inserted into holes in two adjacent pieces and holds them together	a fastener that is inserted into holes in two adjacent pieces and holds them together