incrustation vs ornamentation

incrustation and ornamentation both are nouns.

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

As nouns, ornamentation is a hypernym of incrustation; that is, ornamentation 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
ornamentation: something used to beautify

Other hypernyms of incrustation include decoration, ornament.

incrustation (noun)	ornamentation (noun)
a decorative coating of contrasting material that is applied to a surface as an inlay or overlay	the act of adding extraneous decorations to something
a hard outer layer that covers something	something used to beautify
the formation of a crust	the state of being ornamented