outercourse vs sexual activity

outercourse and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
outercourse	Yes	No	No	No
sexual activity	Yes	No	No	No

As nouns, sexual activity is a hypernym of outercourse; that is, sexual activity is a word with a broader meaning than outercourse:

Other hypernyms of outercourse include sex, sex activity, sexual practice.

outercourse (noun)	sexual activity (noun)
sexual stimulation without vaginal penetration	activities associated with sexual intercourse