Origanum majorana vs sweet marjoram

Origanum majorana and sweet marjoram both are nouns.

Word	Noun	Adjective	Verb	Adverb
Origanum majorana	Yes	No	No	No
sweet marjoram	Yes	No	No	No

As nouns, Origanum majorana and sweet marjoram are synonyms defined as:

Origanum majorana and sweet marjoram: aromatic European plant native to Mediterranean and Turkey; not widespread in Europe

Other synonyms of Origanum majorana include knotted marjoram, Majorana hortensis.

Origanum majorana (noun)	sweet marjoram (noun)
aromatic European plant native to Mediterranean and Turkey; not widespread in Europe	aromatic European plant native to Mediterranean and Turkey; not widespread in Europe