pureblooded vs thoroughbred

pureblooded is not a noun while thoroughbred is a noun.

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

As adjectives, pureblooded and thoroughbred are synonyms defined as:

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

Other synonyms of pureblooded include pedigree, pedigreed, pureblood.

pureblooded (noun)	thoroughbred (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

pureblooded (adjective)	thoroughbred (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