oregano vs Origanum vulgare

oregano and Origanum vulgare both are nouns.

Word	Noun	Adjective	Verb	Adverb
oregano	Yes	No	No	No
Origanum vulgare	Yes	No	No	No

As nouns, oregano and Origanum vulgare are synonyms defined as:

Other synonyms of oregano include marjoram, pot marjoram, wild marjoram, winter sweet.

oregano (noun)	Origanum vulgare (noun)
pungent leaves used as seasoning with meats and fowl and in stews and soups and omelets	aromatic Eurasian perennial
aromatic Eurasian perennial