pollution vs impureness

pollution and impureness both are nouns.

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

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

pollution: undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
impureness: the condition of being impure

Other hypernyms of pollution include impurity, environmental condition.

pollution (noun)	impureness (noun)
the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors	the condition of being impure
undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
the state of being polluted