befoulment vs pollution

befoulment and pollution both are nouns.

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

As nouns, befoulment and pollution are synonyms defined as:

Other synonyms of befoulment include defilement.

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