zip fastener vs fastener

zip fastener and fastener both are nouns.

Word	Noun	Adjective	Verb	Adverb
zip fastener	Yes	No	No	No
fastener	Yes	No	No	No

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

zip fastener: a fastener for locking together two toothed edges by means of a sliding tab
fastener: restraint that attaches to something or holds something in place

Other hypernyms of zip fastener include fastening, fixing, holdfast.

zip fastener (noun)	fastener (noun)
a fastener for locking together two toothed edges by means of a sliding tab	restraint that attaches to something or holds something in place
	a person who fastens or makes fast