coating vs fumigation

coating and fumigation both are nouns.

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

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

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

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