bronc vs mustang

bronc and mustang both are nouns.

Word	Noun	Adjective	Verb	Adverb
bronc	Yes	No	No	No
mustang	Yes	No	No	No

As nouns, mustang is a hypernym of bronc; that is, mustang is a word with a broader meaning than bronc:

bronc: an unbroken or imperfectly broken mustang
mustang: small hardy range horse of the western plains descended from horses brought by the Spanish

bronc (noun)	mustang (noun)
an unbroken or imperfectly broken mustang	small hardy range horse of the western plains descended from horses brought by the Spanish