immorality vs iniquity

immorality

noun
  • An immoral act or practice. 

  • The state or quality of being immoral; vice. 

iniquity

noun
  • An act of great injustice or unfairness; a sinful or wicked act; an unconscionable deed. 

  • Deviation from what is right; gross injustice, sin, wickedness. 

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