hedge nettle vs Stachys palustris

hedge nettle and Stachys palustris both are nouns.

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

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

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

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