blackberry vs berry

blackberry and berry both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackberry	Yes	No	Yes	No
berry	Yes	No	Yes	No

As nouns, berry is a hypernym of blackberry; that is, berry is a word with a broader meaning than blackberry:

blackberry: large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus
berry: any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves

Other hypernyms of blackberry include drupelet.

As verbs, berry is a hypernym of blackberry; that is, berry is a word with a broader meaning than blackberry:

blackberry (noun)	berry (noun)
large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus	any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves
bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle	a small fruit having any of various structures, e.g., simple (grape or blueberry) or aggregate (blackberry or raspberry)

blackberry (verb)	berry (verb)
pick or gather blackberries	pick or gather berries