bog rhubarb vs butterbur

bog rhubarb and butterbur both are nouns.

Word	Noun	Adjective	Verb	Adverb
bog rhubarb	Yes	No	No	No
butterbur	Yes	No	No	No

As nouns, bog rhubarb and butterbur are synonyms defined as:

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

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

bog rhubarb (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