Calystegia sepium vs bindweed

Calystegia sepium and bindweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Calystegia sepium	Yes	No	No	No
bindweed	Yes	No	No	No

As nouns, bindweed is a hypernym of Calystegia sepium; that is, bindweed is a word with a broader meaning than Calystegia sepium:

Calystegia sepium: common Eurasian and American wild climber with pink flowers; sometimes placed in genus Convolvulus
bindweed: any of several vines of the genera Convolvulus and Calystegia having a twining habit

Calystegia sepium (noun)	bindweed (noun)
common Eurasian and American wild climber with pink flowers; sometimes placed in genus Convolvulus	any of several vines of the genera Convolvulus and Calystegia having a twining habit