impurity vs dirtiness

impurity and dirtiness both are nouns.

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

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

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

impurity (noun)	dirtiness (noun)
the condition of being impure	obscenity in speech or writing
worthless or dangerous material that should be removed	the state of being unsanitary
	the state of containing dirty impurities