pollution vs soilure

pollution and soilure both are nouns.

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

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

pollution: the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
soilure: the act of soiling something

Other hypernyms of pollution include dirtying, soiling.

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