Helleborus viridis vs green hellebore

Helleborus viridis and green hellebore both are nouns.

Word	Noun	Adjective	Verb	Adverb
Helleborus viridis	Yes	No	No	No
green hellebore	Yes	No	No	No

As nouns, Helleborus viridis and green hellebore are synonyms defined as:

Helleborus viridis and green hellebore: deciduous plant with large deep green pedate leaves and nodding saucer-shaped green flowers

Helleborus viridis (noun)	green hellebore (noun)
deciduous plant with large deep green pedate leaves and nodding saucer-shaped green flowers	deciduous plant with large deep green pedate leaves and nodding saucer-shaped green flowers