breeding vs propagation

breeding and propagation both are nouns.

Word	Noun	Adjective	Verb	Adverb
breeding	Yes	Yes	No	No
propagation	Yes	No	No	No

As nouns, propagation is a hyponym of breeding; that is, propagation is a word with a more specific, narrower meaning than breeding:

breeding: the sexual activity of conceiving and bearing offspring
propagation: the act of producing offspring or multiplying by such production

Other hyponyms of breeding include crossbreeding, interbreeding, miscegenation, generation, multiplication.

breeding (noun)	propagation (noun)
the sexual activity of conceiving and bearing offspring	the act of producing offspring or multiplying by such production
helping someone grow up to be an accepted member of the community	the spreading of something (a belief or practice) into new regions
the production of animals or plants by inbreeding or hybridization	the movement of a wave through a medium
the result of good upbringing (especially knowledge of correct social behavior)
elegance by virtue of fineness of manner and expression

breeding (adjective)	propagation (adjective)
producing offspring or set aside especially for producing offspring