snap fastener vs fastener

snap fastener and fastener both are nouns.

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

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

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

snap fastener (noun)	fastener (noun)
a fastener used on clothing; fastens with a snapping sound	restraint that attaches to something or holds something in place
	a person who fastens or makes fast