procreation vs sex activity

procreation and sex activity both are nouns.

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

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

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

procreation (noun)	sex activity (noun)
the sexual activity of conceiving and bearing offspring	activities associated with sexual intercourse