fornication vs adultery

fornication and adultery both are nouns.

Word	Noun	Adjective	Verb	Adverb
fornication	Yes	No	No	No
adultery	Yes	No	No	No

As nouns, fornication and adultery are synonyms defined as:

fornication and adultery: extramarital sex that willfully and maliciously interferes with marriage relations

Other synonyms of fornication include criminal conversation.

fornication (noun)	adultery (noun)
voluntary sexual intercourse between persons not married to each other	extramarital sex that willfully and maliciously interferes with marriage relations
extramarital sex that willfully and maliciously interferes with marriage relations