paper fastener vs fixing

paper fastener and fixing both are nouns.

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

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

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

paper fastener (noun)	fixing (noun)
a fastener for holding a sheet of paper in place	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