encrust vs encrustation

encrust is not a noun while encrustation is a noun.

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

encrust (noun)	encrustation (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

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