encrustation vs encrust

encrustation is a noun but encrust is not a noun.

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

encrustation (noun)	encrust (noun)
a decorative coating of contrasting material that is applied to a surface as an inlay or overlay
a hard outer layer that covers something
the formation of a crust

encrustation (verb)	encrust (verb)
	form a crust or a hard layer
	cover or coat with a crust
	decorate or cover lavishly (as with gems)