white hellebore vs American hellebore

white hellebore and American hellebore both are nouns.

Word	Noun	Adjective	Verb	Adverb
white hellebore	Yes	No	No	No
American hellebore	Yes	No	No	No

As nouns, white hellebore and American hellebore are synonyms defined as:

white hellebore and American hellebore: North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally

Other synonyms of white hellebore include bugbane, Indian poke, Veratrum viride.

white hellebore (noun)	American hellebore (noun)
North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally	North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally