Stachys palustris vs hedge nettle

Stachys palustris and hedge nettle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stachys palustris	Yes	No	No	No
hedge nettle	Yes	No	No	No

As nouns, Stachys palustris and hedge nettle are synonyms defined as:

Stachys palustris and hedge nettle: perennial herb with an odorless rhizome widespread in moist places in Northern Hemisphere

Stachys palustris (noun)	hedge nettle (noun)
perennial herb with an odorless rhizome widespread in moist places in Northern Hemisphere	foul-smelling perennial Eurasiatic herb with a green creeping rhizome
	perennial herb with an odorless rhizome widespread in moist places in Northern Hemisphere