pennyroyal oil vs Hedeoma pulegioides

pennyroyal oil and Hedeoma pulegioides both are nouns.

Word	Noun	Adjective	Verb	Adverb
pennyroyal oil	Yes	No	No	No
Hedeoma pulegioides	Yes	No	No	No

pennyroyal oil (noun)	Hedeoma pulegioides (noun)
oil from European pennyroyal having an odor like mint; used chiefly in soaps	erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
aromatic oil from American pennyroyal