black walnut vs Juglans nigra

black walnut and Juglans nigra both are nouns.

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

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

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

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

black walnut (noun)	Juglans nigra (noun)
American walnut having a very hard and thick woody shell	North American walnut tree with hard dark wood and edible nut
North American walnut tree with hard dark wood and edible nut