fumigation vs covering

fumigation and covering both are nouns.

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

As nouns, covering is a hypernym of fumigation; that is, covering 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
covering: the work of applying something

Other hypernyms of fumigation include application, coating.

fumigation (noun)	covering (noun)
the application of a gas or smoke to something for the purpose of disinfecting it	the act of protecting something by covering it
	the work of applying something
	the act of concealing the existence of something by obstructing the view of it
	an artifact that covers something else (usually to protect or shelter or conceal it)
	a natural object that covers or envelops