carabiner vs holdfast

carabiner and holdfast both are nouns.

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

As nouns, holdfast is a hypernym of carabiner; that is, holdfast 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
holdfast: restraint that attaches to something or holds something in place

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

carabiner (noun)	holdfast (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