crust vs encrustation

crust and encrustation both are nouns.

Word	Noun	Adjective	Verb	Adverb
crust	Yes	No	Yes	No
encrustation	Yes	No	No	No

As nouns, crust and encrustation are synonyms defined as:

Other synonyms of crust include incrustation.

crust (noun)	encrustation (noun)
the trait of being rude and impertinent; inclined to take liberties	a decorative coating of contrasting material that is applied to a surface as an inlay or overlay
the outer layer of the Earth	a hard outer layer that covers something
a hard outer layer that covers something	the formation of a crust

crust (verb)	encrustation (verb)
form a crust or form into a crust