Bos primigenius vs aurochs

Bos primigenius and aurochs both are nouns.

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

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

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

Other synonyms of Bos primigenius include urus.

Bos primigenius (noun)	aurochs (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