practical vs working

practical is not a noun while working is a noun.

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

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

practical (adjective)	working (adjective)
concerned with actual use or practice	actively engaged in paid work
having or put to a practical purpose or use	(of e.g. a machine) performing or capable of performing
guided by practical experience and observation rather than theory	adopted as a temporary basis for further work
being actually such in almost every respect	adequate for practical use; especially sufficient in strength or numbers to accomplish something
	serving to permit or facilitate further work or activity