decontaminant vs disinfectant

decontaminant

noun

  • Any substance used for decontamination. 

disinfectant

noun

  • A substance that kills germs and/or viruses. 

adj

  • Serving to kill germs or viruses. 

How often have the words decontaminant and disinfectant occurred in a corpus of books? (source: Google Ngram Viewer )