employed vs working

employed is not a noun while working is a noun.

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

employed (noun)	working (noun)
	a mine or quarry that is being or has been worked

employed (adjective)	working (adjective)
having your services engaged for; or having a job especially one that pays wages or a salary	actively engaged in paid work
made useful	(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