briony vs Bryonia alba

briony and Bryonia alba both are nouns.

Word	Noun	Adjective	Verb	Adverb
briony	Yes	No	No	No
Bryonia alba	Yes	No	No	No

As nouns, Bryonia alba is a hyponym of briony; that is, Bryonia alba is a word with a more specific, narrower meaning than briony:

briony: a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties
Bryonia alba: white-flowered vine having thick roots and bearing small black berries; Europe to Iran

Other hyponyms of briony include devil's turnip, white bryony, Bryonia dioica, red bryony, wild hop.

briony (noun)	Bryonia alba (noun)
a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties	white-flowered vine having thick roots and bearing small black berries; Europe to Iran