dirtiness vs dirt

dirtiness and dirt both are nouns.

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

As nouns, dirt is a hyponym of dirtiness; that is, dirt is a word with a more specific, narrower meaning than dirtiness:

dirtiness (noun)	dirt (noun)
obscenity in speech or writing	disgraceful gossip about the private lives of other people
the state of being unsanitary	anything regarded as making something unclean
the state of containing dirty impurities	the part of the earth's surface consisting of humus and disintegrated rock
	obscene terms for feces

dirtiness (adjective)	dirt (adjective)
	(of roads) not leveled or drained; unsuitable for all year travel