purebred vs pureblood

purebred and pureblood both are nouns.

Word	Noun	Adjective	Verb	Adverb
purebred	Yes	Yes	No	No
pureblood	Yes	Yes	No	No

As nouns, purebred and pureblood are synonyms defined as:

purebred and pureblood: a pedigreed animal of unmixed lineage; used especially of horses

Other synonyms of purebred include thoroughbred.

purebred (noun)	pureblood (noun)
a pedigreed animal of unmixed lineage; used especially of horses	a pedigreed animal of unmixed lineage; used especially of horses

purebred (adjective)	pureblood (adjective)
bred for many generations from member of a recognized breed or strain	having a list of ancestors as proof of being a purebred animal