Mercurialis perennis vs dog's mercury

Mercurialis perennis and dog's mercury both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mercurialis perennis	Yes	No	No	No
dog's mercury	Yes	No	No	No

As nouns, Mercurialis perennis and dog's mercury are synonyms defined as:

Mercurialis perennis and dog's mercury: European perennial weedy plant with greenish flowers

Other synonyms of Mercurialis perennis include dog mercury.

Mercurialis perennis (noun)	dog's mercury (noun)
European perennial weedy plant with greenish flowers	European perennial weedy plant with greenish flowers