hook and eye vs fastener

hook and eye and fastener both are nouns.

Word	Noun	Adjective	Verb	Adverb
hook and eye	Yes	No	No	No
fastener	Yes	No	No	No

As nouns, fastener is a hypernym of hook and eye; that is, fastener is a word with a broader meaning than hook and eye:

Other hypernyms of hook and eye include fastening, fixing, holdfast.

hook and eye (noun)	fastener (noun)
a kind of fastener used on clothing	restraint that attaches to something or holds something in place
	a person who fastens or makes fast