abstergent vs fumigant

abstergent

noun

  • A substance used to cleanse; a detergent. 

adj

  • Cleansing, detergent. 

fumigant

noun

  • Any substance used, in the gaseous state, to fumigate or disinfect. 

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