black raspberry vs blackcap raspberry

black raspberry and blackcap raspberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
black raspberry	Yes	No	No	No
blackcap raspberry	Yes	No	No	No

As nouns, black raspberry and blackcap raspberry are synonyms defined as:

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

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

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