copulation vs sexual congress

copulation and sexual congress both are nouns.

Word	Noun	Adjective	Verb	Adverb
copulation	Yes	No	No	No
sexual congress	Yes	No	No	No

As nouns, copulation and sexual congress are synonyms defined as:

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

copulation (noun)	sexual congress (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