impureness vs dirtiness

impureness and dirtiness both are nouns.

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

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

Other hyponyms of impureness include adulteration, debasement, admixture, alloy, contamination, taint, putridity, pollution.

impureness (noun)	dirtiness (noun)
the condition of being impure	obscenity in speech or writing
	the state of being unsanitary
	the state of containing dirty impurities