dowel pin vs fastener

dowel pin and fastener both are nouns.

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

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

dowel pin: a fastener that is inserted into holes in two adjacent pieces and holds them together
fastener: restraint that attaches to something or holds something in place

Other hypernyms of dowel pin include fastening, fixing, holdfast.

dowel pin (noun)	fastener (noun)
a fastener that is inserted into holes in two adjacent pieces and holds them together	restraint that attaches to something or holds something in place
	a person who fastens or makes fast