encrustation vs ornament

encrustation and ornament both are nouns.

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

As nouns, ornament is a hypernym of encrustation; that is, ornament is a word with a broader meaning than encrustation:

encrustation: a decorative coating of contrasting material that is applied to a surface as an inlay or overlay
ornament: something used to beautify

Other hypernyms of encrustation include decoration, ornamentation.

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

encrustation (verb)	ornament (verb)
	make more attractive by adding ornament, colour, etc.
	be an ornament to