cleansing vs purgative

cleansing

adj

  • That cleanses. 

noun

  • The process of removing dirt, toxins etc. 

purgative

adj

  • purging 

noun

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

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