fumigation vs coating

fumigation and coating both are nouns.

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

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

fumigation: the application of a gas or smoke to something for the purpose of disinfecting it
coating: the work of applying something

Other hypernyms of fumigation include application, covering.

fumigation (noun)	coating (noun)
the application of a gas or smoke to something for the purpose of disinfecting it	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)