harden vs anneal

harden and anneal both are verbs.

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

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

harden: make hard or harder
anneal: bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling

Other hyponyms of harden include face-harden, callus, normalize, temper.

harden (verb)	anneal (verb)
become hard or harder	bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling
make hard or harder
make healthy
cause to accept or become hardened to; habituate
harden by reheating and cooling in oil