noun (n)

• the state of being contaminated(noun.state)

  Synonym:
  taint
  

  source: wordnet30
• a substance that contaminates(noun.substance)

  Synonym:
  contaminant
  

  source: wordnet30
• the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors(noun.act)

  Synonym:
  pollution
  Antonym:
  decontamination
  

  source: wordnet30
• The act or process of contaminating; pollution; defilement; taint; also, that which contaminates.(noun)

  source: webster1913