harden vs calcify

harden and calcify both are verbs.

Word	Noun	Adjective	Verb	Adverb
harden	No	No	Yes	No
calcify	No	No	Yes	No

As verbs, calcify is a hyponym of harden; that is, calcify is a word with a more specific, narrower meaning than harden:

Other hyponyms of harden include encrust, incrust, callus, cure.

harden (verb)	calcify (verb)
become hard or harder	turn into lime; become calcified
make hard or harder	convert into lime
make healthy	become impregnated with calcium salts
cause to accept or become hardened to; habituate	become inflexible and unchanging
harden by reheating and cooling in oil