annealing vs hardening

annealing and hardening both are nouns.

Word	Noun	Adjective	Verb	Adverb
annealing	Yes	No	No	No
hardening	Yes	No	No	No

As nouns, hardening is a hypernym of annealing; that is, hardening is a word with a broader meaning than annealing:

annealing: hardening something by heat treatment
hardening: the act of making something harder (firmer or tighter or more compact)

annealing (noun)	hardening (noun)
hardening something by heat treatment	the act of making something harder (firmer or tighter or more compact)
	the process of becoming hard or solid by cooling or drying or crystallization
	abnormal hardening or thickening of tissue