sweet marjoram vs origanum

sweet marjoram and origanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet marjoram	Yes	No	No	No
origanum	Yes	No	No	No

As nouns, origanum is a hypernym of sweet marjoram; that is, origanum is a word with a broader meaning than sweet marjoram:

sweet marjoram: aromatic European plant native to Mediterranean and Turkey; not widespread in Europe
origanum: any of various fragrant aromatic herbs of the genus Origanum used as seasonings

sweet marjoram (noun)	origanum (noun)
aromatic European plant native to Mediterranean and Turkey; not widespread in Europe	any of various fragrant aromatic herbs of the genus Origanum used as seasonings