sexual relation vs coition

sexual relation and coition both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual relation	Yes	No	No	No
coition	Yes	No	No	No

As nouns, sexual relation and coition are synonyms defined as:

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

sexual relation (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