snap ring vs fixing

snap ring and fixing both are nouns.

Word	Noun	Adjective	Verb	Adverb
snap ring	Yes	No	No	No
fixing	Yes	No	No	No

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

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

Other hypernyms of snap ring include fastener, fastening, holdfast, hoop, ring, climbing equipment, rock-climbing equipment.

snap ring (noun)	fixing (noun)
an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes	the act of putting something in working order again
	the sterilization of an animal
	(histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body
	restraint that attaches to something or holds something in place