incrustation vs crust

incrustation and crust both are nouns.

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

As nouns, incrustation and crust are synonyms defined as:

Other synonyms of incrustation include encrustation.

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

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