Thesaurus.com
Dictionary.com
Definitions

contaminant

[kuhn-tam-uh-nuhnt] / kənˈtæm ə nənt /
NOUN
contaminator
Synonyms
STRONGEST
contamination impurity poison pollutant toxin
STRONG
adulterant
WEAK
foreign matter

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.