carnal knowledge vs sexual intercourse

carnal knowledge and sexual intercourse both are nouns.

Word	Noun	Adjective	Verb	Adverb
carnal knowledge	Yes	No	No	No
sexual intercourse	Yes	No	No	No

As nouns, carnal knowledge and sexual intercourse are synonyms defined as:

carnal knowledge and sexual intercourse: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur

Other synonyms of carnal knowledge include coition, coitus, copulation, intercourse, relation, sex act, sexual congress, sexual relation.

carnal knowledge (noun)	sexual intercourse (noun)
sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur	sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur