Bos vs Bos primigenius

Bos and Bos primigenius both are nouns.

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

Bos (noun)	Bos primigenius (noun)
wild and domestic cattle; in some classifications placed in the subfamily Bovinae or tribe Bovini	large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle