incest vs criminal congress

incest and criminal congress both are nouns.

Word	Noun	Adjective	Verb	Adverb
incest	Yes	No	No	No
criminal congress	Yes	No	No	No

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

incest: sexual intercourse between persons too closely related to marry (as between a parent and a child)
criminal congress: forbidden or tabu sexual intercourse between individuals

Other hypernyms of incest include unlawful carnal knowledge.

incest (noun)	criminal congress (noun)
sexual intercourse between persons too closely related to marry (as between a parent and a child)	forbidden or tabu sexual intercourse between individuals