Petasites hybridus vs bog rhubarb

Petasites hybridus and bog rhubarb both are nouns.

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

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

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

Other synonyms of Petasites hybridus include butterbur, Petasites vulgaris.

Petasites hybridus (noun)	bog rhubarb (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