encrust vs ornament

encrust is not a noun while ornament is a noun.

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

As verbs, ornament is a hypernym of encrust; that is, ornament is a word with a broader meaning than encrust:

Other hypernyms of encrust include adorn, beautify, decorate, embellish, grace.

encrust (noun)	ornament (noun)
	something used to beautify

encrust (verb)	ornament (verb)
form a crust or a hard layer	make more attractive by adding ornament, colour, etc.
cover or coat with a crust	be an ornament to
decorate or cover lavishly (as with gems)