black raspberry vs Rubus occidentalis

black raspberry and Rubus occidentalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
black raspberry	Yes	No	No	No
Rubus occidentalis	Yes	No	No	No

As nouns, black raspberry and Rubus occidentalis are synonyms defined as:

black raspberry and Rubus occidentalis: raspberry native to eastern North America having black thimble-shaped fruit

Other synonyms of black raspberry include blackcap, blackcap raspberry, thimbleberry.

black raspberry (noun)	Rubus occidentalis (noun)
raspberry native to eastern North America having black thimble-shaped fruit	raspberry native to eastern North America having black thimble-shaped fruit