free love vs criminal congress

free love and criminal congress both are nouns.

Word	Noun	Adjective	Verb	Adverb
free love	Yes	No	No	No
criminal congress	Yes	No	No	No

As nouns, criminal congress is a hypernym of free love; that is, criminal congress is a word with a broader meaning than free love:

free love: sexual intercourse between individuals who are not married to one another
criminal congress: forbidden or tabu sexual intercourse between individuals

Other hypernyms of free love include unlawful carnal knowledge.

free love (noun)	criminal congress (noun)
sexual intercourse between individuals who are not married to one another	forbidden or tabu sexual intercourse between individuals