aurochs vs wild ox

aurochs and wild ox both are nouns.

Word	Noun	Adjective	Verb	Adverb
aurochs	Yes	No	No	No
wild ox	Yes	No	No	No

As nouns, wild ox is a hypernym of aurochs; that is, wild ox is a word with a broader meaning than aurochs:

aurochs: large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle
wild ox: any of various wild bovines especially of the genera Bos or closely related Bibos

Other hypernyms of aurochs include ox.

aurochs (noun)	wild ox (noun)
large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle	any of various wild bovines especially of the genera Bos or closely related Bibos
European bison having a smaller and higher head than the North American bison