incrustation vs covering

incrustation and covering both are nouns.

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

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

Other hypernyms of incrustation include cover, natural covering.

incrustation (noun)	covering (noun)
a decorative coating of contrasting material that is applied to a surface as an inlay or overlay	the act of protecting something by covering it
a hard outer layer that covers something	the work of applying something
the formation of a crust	the act of concealing the existence of something by obstructing the view of it
	an artifact that covers something else (usually to protect or shelter or conceal it)
	a natural object that covers or envelops