finishing coat vs coating

finishing coat and coating both are nouns.

Word	Noun	Adjective	Verb	Adverb
finishing coat	Yes	No	No	No
coating	Yes	No	No	No

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

Other hypernyms of finishing coat include coat, plaster.

finishing coat (noun)	coating (noun)
the final coating of (e.g., paint, plaster, varnish, etc.)	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)