linkup vs fixing

linkup and fixing both are nouns.

Word	Noun	Adjective	Verb	Adverb
linkup	Yes	No	No	No
fixing	Yes	No	No	No

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

Other hypernyms of linkup include fastener, fastening, holdfast.

linkup (noun)	fixing (noun)
a fastener that serves to join or connect	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