coating vs painting

coating and painting both are nouns.

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

As nouns, painting is a hyponym of coating; that is, painting is a word with a more specific, narrower meaning than coating:

coating (noun)	painting (noun)
the work of applying something	creating a picture with paints
a thin layer covering something	the occupation of a house painter
a heavy fabric suitable for coats	the act of applying paint to a surface
a decorative texture or appearance of a surface (or the substance that gives it that appearance)	graphic art consisting of an artistic composition made by applying paints to a surface