calcification vs hardening

calcification and hardening both are nouns.

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

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

calcification (noun)	hardening (noun)
a process that impregnates something with calcium (or calcium salts)	the act of making something harder (firmer or tighter or more compact)
tissue hardened by deposition of lime salts	the process of becoming hard or solid by cooling or drying or crystallization
an inflexible and unchanging state	abnormal hardening or thickening of tissue