scumble vs coating

scumble and coating both are nouns.

Word	Noun	Adjective	Verb	Adverb
scumble	Yes	No	No	No
coating	Yes	No	No	No

As nouns, coating is a hypernym of scumble; that is, coating is a word with a broader meaning than scumble:

scumble: the application of very thin coat of color over the surface of a picture
coating: the work of applying something

Other hypernyms of scumble include application, covering.

scumble (noun)	coating (noun)
the application of very thin coat of color over the surface of a picture	the work of applying something
	a thin layer covering something
	a heavy fabric suitable for coats
	a decorative texture or appearance of a surface (or the substance that gives it that appearance)