copulation vs carnal knowledge

copulation and carnal knowledge both are nouns.

Word	Noun	Adjective	Verb	Adverb
copulation	Yes	No	No	No
carnal knowledge	Yes	No	No	No

As nouns, copulation and carnal knowledge are synonyms defined as:

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

copulation (noun)	carnal knowledge (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