adulteration vs impureness

adulteration and impureness both are nouns.

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

As nouns, impureness is a hypernym of adulteration; that is, impureness is a word with a broader meaning than adulteration:

adulteration: being mixed with extraneous material; the product of adulterating
impureness: the condition of being impure

Other hypernyms of adulteration include impurity.

adulteration (noun)	impureness (noun)
the act of adulterating (especially the illicit substitution of one substance for another)	the condition of being impure
being mixed with extraneous material; the product of adulterating