harden vs encrust

harden and encrust both are verbs.

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

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

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

harden (verb)	encrust (verb)
become hard or harder	form a crust or a hard layer
make hard or harder	cover or coat with a crust
make healthy	decorate or cover lavishly (as with gems)
cause to accept or become hardened to; habituate
harden by reheating and cooling in oil