modify vs harden

modify and harden both are verbs.

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

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

modify (verb)	harden (verb)
make less severe or harsh or extreme	become hard or harder
add a modifier to a constituent	make hard or harder
cause to change; make different; cause a transformation	make healthy
	cause to accept or become hardened to; habituate
	harden by reheating and cooling in oil