manual labor vs coating

manual labor and coating both are nouns.

Word	Noun	Adjective	Verb	Adverb
manual labor	Yes	No	No	No
coating	Yes	No	No	No

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

Other hyponyms of manual labor include application, covering, bodywork, handling, picking, planking, wiring.

manual labor (noun)	coating (noun)
labor done with the hands	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)