registry vs studbook

registry and studbook both are nouns.

Word	Noun	Adjective	Verb	Adverb
registry	Yes	No	No	No
studbook	Yes	No	No	No

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

registry: an official written record of names or events or transactions
studbook: official record of the pedigree of purebred animals especially horses

Other hyponyms of registry include cadaster, cadastre, check register, rent-roll, regest.

registry (noun)	studbook (noun)
an official written record of names or events or transactions	official record of the pedigree of purebred animals especially horses