bog rhubarb vs Petasites vulgaris

bog rhubarb and Petasites vulgaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
bog rhubarb	Yes	No	No	No
Petasites vulgaris	Yes	No	No	No

As nouns, bog rhubarb and Petasites vulgaris are synonyms defined as:

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

Other synonyms of bog rhubarb include butterbur, Petasites hybridus.

bog rhubarb (noun)	Petasites vulgaris (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