coitus vs coition

coitus and coition both are nouns.

Word	Noun	Adjective	Verb	Adverb
coitus	Yes	No	No	No
coition	Yes	No	No	No

As nouns, coitus and coition are synonyms defined as:

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

coitus (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