adulteration vs impurity

adulteration and impurity both are nouns.

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

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

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

Other hypernyms of adulteration include impureness.

adulteration (noun)	impurity (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	worthless or dangerous material that should be removed