functioning vs working

functioning and working both are nouns.

Word	Noun	Adjective	Verb	Adverb
functioning	Yes	Yes	No	No
working	Yes	Yes	No	No

functioning (noun)	working (noun)
process or manner of functioning or operating	a mine or quarry that is being or has been worked

functioning (adjective)	working (adjective)
performing or able to perform its regular function	actively engaged in paid work
	(of e.g. a machine) performing or capable of performing
	adopted as a temporary basis for further work
	adequate for practical use; especially sufficient in strength or numbers to accomplish something
	serving to permit or facilitate further work or activity