dirt vs unimproved

dirt is a noun but unimproved is not a noun.

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

dirt (noun)	unimproved (noun)
disgraceful gossip about the private lives of other people
anything regarded as making something unclean
the part of the earth's surface consisting of humus and disintegrated rock
obscene terms for feces

dirt (adjective)	unimproved (adjective)
(of roads) not leveled or drained; unsuitable for all year travel	not made more desirable or valuable or profitable; especially not made ready for use or marketing
	(of land) not cleared of trees and brush; in the wild or natural state