wolf's bane vs wolfbane

wolf's bane and wolfbane both are nouns.

Word	Noun	Adjective	Verb	Adverb
wolf's bane	Yes	No	No	No
wolfbane	Yes	No	No	No

As nouns, wolf's bane and wolfbane are synonyms defined as:

wolf's bane and wolfbane: poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock

Other synonyms of wolf's bane include Aconitum lycoctonum, wolfsbane.

wolf's bane (noun)	wolfbane (noun)
poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock	poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock