working vs functioning

working and functioning both are nouns.

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

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

working (adjective)	functioning (adjective)
actively engaged in paid work	performing or able to perform its regular function
(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