briony vs red bryony

briony and red bryony both are nouns.

Word	Noun	Adjective	Verb	Adverb
briony	Yes	No	No	No
red bryony	Yes	No	No	No

As nouns, red bryony is a hyponym of briony; that is, red bryony 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
red bryony: bryony having fleshy roots pale green flowers and very small red berries; found in Europe, North Africa, western Asia

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

briony (noun)	red bryony (noun)
a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties	bryony having fleshy roots pale green flowers and very small red berries; found in Europe, North Africa, western Asia