contamination vs contaminant

contamination and contaminant both are nouns.

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

As nouns, contamination and contaminant are synonyms defined as:

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