Bos primigenius vs wild ox

Bos primigenius and wild ox both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bos primigenius	Yes	No	No	No
wild ox	Yes	No	No	No

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

Bos primigenius: 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 Bos primigenius include ox.

Bos primigenius (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