karabiner vs holdfast

karabiner and holdfast both are nouns.

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

As nouns, holdfast is a hypernym of karabiner; that is, holdfast is a word with a broader meaning than karabiner:

karabiner: 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 karabiner include fastener, fastening, fixing, hoop, ring, climbing equipment, rock-climbing equipment.

karabiner (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