boysenberry vs Rubus ursinus

boysenberry and Rubus ursinus both are nouns.

Word	Noun	Adjective	Verb	Adverb
boysenberry	Yes	No	No	No
Rubus ursinus	Yes	No	No	No

As nouns, Rubus ursinus is a hypernym of boysenberry; that is, Rubus ursinus is a word with a broader meaning than boysenberry:

boysenberry: cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries
Rubus ursinus: American blackberry with oblong black fruit

Other hypernyms of boysenberry include western blackberry, western dewberry.

boysenberry (noun)	Rubus ursinus (noun)
large raspberry-flavored fruit; cross between blackberries and raspberries	American blackberry with oblong black fruit
cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries