hook and eye vs fastening

hook and eye and fastening both are nouns.

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

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

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

hook and eye (noun)	fastening (noun)
a kind of fastener used on clothing	the act of fastening things together
	restraint that attaches to something or holds something in place