herb mercury vs herbs mercury

herb mercury and herbs mercury both are nouns.

Word	Noun	Adjective	Verb	Adverb
herb mercury	Yes	No	No	No
herbs mercury	Yes	No	No	No

As nouns, herb mercury and herbs mercury are synonyms defined as:

herb mercury and herbs mercury: Eurafrican annual naturalized in America as a weed; formerly dried for use as a purgative, diuretic or antisyphilitic

Other synonyms of herb mercury include boys-and-girls, Mercurialis annua.

herb mercury (noun)	herbs mercury (noun)
Eurafrican annual naturalized in America as a weed; formerly dried for use as a purgative, diuretic or antisyphilitic	Eurafrican annual naturalized in America as a weed; formerly dried for use as a purgative, diuretic or antisyphilitic