black walnut tree vs Juglans nigra

black walnut tree and Juglans nigra both are nouns.

Word	Noun	Adjective	Verb	Adverb
black walnut tree	Yes	No	No	No
Juglans nigra	Yes	No	No	No

As nouns, black walnut tree and Juglans nigra are synonyms defined as:

black walnut tree and Juglans nigra: North American walnut tree with hard dark wood and edible nut

Other synonyms of black walnut tree include black hickory, black walnut.

black walnut tree (noun)	Juglans nigra (noun)
North American walnut tree with hard dark wood and edible nut	North American walnut tree with hard dark wood and edible nut