carabiner vs fastener

carabiner and fastener both are nouns.

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

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

carabiner: an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes
fastener: restraint that attaches to something or holds something in place

Other hypernyms of carabiner include fastening, fixing, holdfast, hoop, ring, climbing equipment, rock-climbing equipment.

carabiner (noun)	fastener (noun)
an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes	restraint that attaches to something or holds something in place
	a person who fastens or makes fast