pureblood vs beast

pureblood and beast both are nouns.

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

As nouns, beast is a hypernym of pureblood; that is, beast is a word with a broader meaning than pureblood:

Other hypernyms of pureblood include animal, animate being, brute, creature, fauna.

pureblood (noun)	beast (noun)
a pedigreed animal of unmixed lineage; used especially of horses	a living organism characterized by voluntary movement
	a cruelly rapacious person

pureblood (adjective)	beast (adjective)
having a list of ancestors as proof of being a purebred animal