unimproved vs scrub

unimproved is not a noun while scrub is a noun.

Word	Noun	Adjective	Verb	Adverb
unimproved	No	Yes	No	No
scrub	Yes	Yes	Yes	No

unimproved (noun)	scrub (noun)
	the act of cleaning a surface by rubbing it with a brush and soap and water
	dense vegetation consisting of stunted trees or bushes

unimproved (adjective)	scrub (adjective)
not made more desirable or valuable or profitable; especially not made ready for use or marketing	(of domestic animals) not selectively bred
(of land) not cleared of trees and brush; in the wild or natural state

unimproved (verb)	scrub (verb)
	wash thoroughly
	clean with hard rubbing
	postpone indefinitely or annul something that was scheduled