incrust vs incrustation

incrust is not a noun while incrustation is a noun.

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

incrust (noun)	incrustation (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

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