sexual intercourse vs sexual congress

sexual intercourse and sexual congress both are nouns.

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

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

sexual intercourse 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

Other synonyms of sexual intercourse include carnal knowledge, coition, coitus, copulation, intercourse, relation, sex act, sexual relation.

sexual intercourse (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