henbane vs Hyoscyamus niger

henbane and Hyoscyamus niger both are nouns.

Word	Noun	Adjective	Verb	Adverb
henbane	Yes	No	No	No
Hyoscyamus niger	Yes	No	No	No

As nouns, henbane and Hyoscyamus niger are synonyms defined as:

henbane and Hyoscyamus niger: poisonous fetid Old World herb having sticky hairy leaves and yellow-brown flowers; yields hyoscyamine and scopolamine

Other synonyms of henbane include black henbane, stinking nightshade.

henbane (noun)	Hyoscyamus niger (noun)
poisonous fetid Old World herb having sticky hairy leaves and yellow-brown flowers; yields hyoscyamine and scopolamine	poisonous fetid Old World herb having sticky hairy leaves and yellow-brown flowers; yields hyoscyamine and scopolamine