carnal knowledge vs coition

carnal knowledge and coition both are nouns.

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

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

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

carnal knowledge (noun)	coition (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