snap fastener vs fixing

snap fastener and fixing both are nouns.

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

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

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

snap fastener (noun)	fixing (noun)
a fastener used on clothing; fastens with a snapping sound	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