incrustation vs ornament

incrustation and ornament both are nouns.

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

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

incrustation: 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 incrustation include decoration, ornamentation.

incrustation (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

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