thoroughbred vs adult

thoroughbred and adult both are nouns.

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

As nouns, adult is a hypernym of thoroughbred; that is, adult is a word with a broader meaning than thoroughbred:

Other hypernyms of thoroughbred include grownup.

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

thoroughbred (adjective)	adult (adjective)
having a list of ancestors as proof of being a purebred animal	(of animals) fully developed
	designed to arouse lust