aurochs vs Bos primigenius

aurochs and Bos primigenius both are nouns.

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

As nouns, aurochs and Bos primigenius are synonyms defined as:

aurochs and Bos primigenius: large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle

Other synonyms of aurochs include urus.

aurochs (noun)	Bos primigenius (noun)
large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle	large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle
European bison having a smaller and higher head than the North American bison