pollution vs uncleanness

pollution and uncleanness both are nouns.

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

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

Other hypernyms of pollution include dirtiness.

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