Helleborus niger vs Christmas rose

Helleborus niger and Christmas rose both are nouns.

Word	Noun	Adjective	Verb	Adverb
Helleborus niger	Yes	No	No	No
Christmas rose	Yes	No	No	No

As nouns, Helleborus niger and Christmas rose are synonyms defined as:

Helleborus niger and Christmas rose: European evergreen plant with white or purplish rose-like winter-blooming flowers

Other synonyms of Helleborus niger include black hellebore, winter rose.

Helleborus niger (noun)	Christmas rose (noun)
European evergreen plant with white or purplish rose-like winter-blooming flowers	European evergreen plant with white or purplish rose-like winter-blooming flowers