dirt vs dirtiness

dirt and dirtiness both are nouns.

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

As nouns, dirtiness is a hypernym of dirt; that is, dirtiness is a word with a broader meaning than dirt:

Other hypernyms of dirt include uncleanness.

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

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