copulation vs coitus

copulation and coitus both are nouns.

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

As nouns, copulation and coitus are synonyms defined as:

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

copulation (noun)	coitus (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