intercourse vs sexual intercourse

intercourse and sexual intercourse both are nouns.

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

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

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

intercourse (noun)	sexual intercourse (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
communication between individuals