detergent vs purgative

detergent

adj
  • Synonym of cleansing. 

noun
  • Any non-soap cleaning agent, especially a synthetic surfactant. 

purgative

adj
  • purging 

noun
  • something, such as a substance or medicine, that purges; laxative 

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