hedge nettle vs Stachys sylvatica

hedge nettle and Stachys sylvatica both are nouns.

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

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

hedge nettle and Stachys sylvatica: foul-smelling perennial Eurasiatic herb with a green creeping rhizome

Other synonyms of hedge nettle include dead nettle.

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