outercourse vs sex activity

outercourse and sex activity both are nouns.

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

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

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

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