pot marjoram vs oregano

pot marjoram and oregano both are nouns.

Word	Noun	Adjective	Verb	Adverb
pot marjoram	Yes	No	No	No
oregano	Yes	No	No	No

As nouns, pot marjoram and oregano are synonyms defined as:

Other synonyms of pot marjoram include marjoram, Origanum vulgare, wild marjoram, winter sweet.

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