Bos primigenius vs ox

Bos primigenius and ox both are nouns.

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

As nouns, ox is a hypernym of Bos primigenius; that is, 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
ox: any of various wild bovines especially of the genera Bos or closely related Bibos

Other hypernyms of Bos primigenius include wild ox.

Bos primigenius (noun)	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
	an adult castrated bull of the genus Bos; especially Bos taurus