Mentha pulegium vs pennyroyal

Mentha pulegium and pennyroyal both are nouns.

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

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

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

Mentha pulegium (noun)	pennyroyal (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