Petasites vulgaris vs butterbur

Petasites vulgaris and butterbur both are nouns.

Word	Noun	Adjective	Verb	Adverb
Petasites vulgaris	Yes	No	No	No
butterbur	Yes	No	No	No

As nouns, Petasites vulgaris and butterbur are synonyms defined as:

Petasites vulgaris and butterbur: small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas

Other synonyms of Petasites vulgaris include bog rhubarb, Petasites hybridus.

Petasites vulgaris (noun)	butterbur (noun)
small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas	small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas