thoroughbred vs pureblooded

thoroughbred is a noun but pureblooded is not a noun.

Word	Noun	Adjective	Verb	Adverb
thoroughbred	Yes	Yes	No	No
pureblooded	No	Yes	No	No

As adjectives, thoroughbred and pureblooded are synonyms defined as:

thoroughbred and pureblooded: having a list of ancestors as proof of being a purebred animal

Other synonyms of thoroughbred include pedigree, pedigreed, pureblood.

thoroughbred (noun)	pureblooded (noun)
a pedigreed animal of unmixed lineage; used especially of horses
a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares
a well-bred person

thoroughbred (adjective)	pureblooded (adjective)
having a list of ancestors as proof of being a purebred animal	having a list of ancestors as proof of being a purebred animal