criminal conversation vs fornication

criminal conversation and fornication both are nouns.

Word	Noun	Adjective	Verb	Adverb
criminal conversation	Yes	No	No	No
fornication	Yes	No	No	No

As nouns, criminal conversation and fornication are synonyms defined as:

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

Other synonyms of criminal conversation include adultery.

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