peppermint vs Mentha piperita

peppermint and Mentha piperita both are nouns.

Word	Noun	Adjective	Verb	Adverb
peppermint	Yes	No	No	No
Mentha piperita	Yes	No	No	No

As nouns, peppermint and Mentha piperita are synonyms defined as:

peppermint and Mentha piperita: herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring

peppermint (noun)	Mentha piperita (noun)
a candy flavored with peppermint oil	herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring
herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring
red gum tree of Tasmania