procreation vs sexual activity

procreation and sexual activity both are nouns.

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

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

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

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