pennyroyal vs Mentha pulegium

pennyroyal and Mentha pulegium both are nouns.

Word	Noun	Adjective	Verb	Adverb
pennyroyal	Yes	No	No	No
Mentha pulegium	Yes	No	No	No

As nouns, pennyroyal and Mentha pulegium are synonyms defined as:

pennyroyal and Mentha pulegium: Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil

pennyroyal (noun)	Mentha pulegium (noun)
Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil	Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil
erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine