contamination vs soiling

contamination and soiling both are nouns.

Word	Noun	Adjective	Verb	Adverb
contamination	Yes	No	No	No
soiling	Yes	No	No	No

As nouns, soiling is a hypernym of contamination; that is, soiling is a word with a broader meaning than contamination:

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

Other hypernyms of contamination include dirtying, soilure.

contamination (noun)	soiling (noun)
the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors	the act of soiling something
the state of being contaminated
a substance that contaminates