Nouns

(n)catharsis, katharsis, purgationpurging the body by the use of a cathartic to stimulate evacuation of the bowels
(n)purification, purgationa ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites
(n)purge, purging, purgationthe act of clearing yourself (or another) from some stigma or charge