adultery vs fornication

adultery

noun
  • Sexual intercourse by a married person with someone other than their spouse. 

  • Lewdness or unchastity of thought as well as act, as forbidden by the seventh commandment. 

  • Faithlessness in religion. 

  • The intrusion of a person into a bishopric during the life of the bishop. 

  • Adulteration; corruption. 

fornication

noun
  • Sexual intercourse by people who are not married to each other, or which is considered illicit in another way. 

  • Sexual intercourse in general; sex. 

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