fixing vs locker

fixing and locker both are nouns.

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

As nouns, locker is a hyponym of fixing; that is, locker is a word with a more specific, narrower meaning than fixing:

fixing (noun)	locker (noun)
the act of putting something in working order again	a storage compartment for clothes and valuables; usually it has a lock
the sterilization of an animal	a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks)
(histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body	a fastener that locks or closes
restraint that attaches to something or holds something in place