breeding vs sexual activity

breeding and sexual activity both are nouns.

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

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

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

breeding (noun)	sexual activity (noun)
the sexual activity of conceiving and bearing offspring	activities associated with sexual intercourse
helping someone grow up to be an accepted member of the community
the production of animals or plants by inbreeding or hybridization
the result of good upbringing (especially knowledge of correct social behavior)
elegance by virtue of fineness of manner and expression

breeding (adjective)	sexual activity (adjective)
producing offspring or set aside especially for producing offspring