breed vs bloodstock

breed and bloodstock both are nouns.

Word	Noun	Adjective	Verb	Adverb
breed	Yes	No	Yes	No
bloodstock	Yes	No	No	No

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

Other hyponyms of breed include pedigree.

breed (noun)	bloodstock (noun)
a special type	thoroughbred horses (collectively)
a special variety of domesticated animals within a species

breed (verb)	bloodstock (verb)
have young (animals) or reproduce (organisms)
copulate with a female, used especially of horses
cause to procreate (animals)
call forth